River Mouth is an annual Hip-Hop showcase put on by 40oz Heroes that brings together local artists from Mississauga and around the GTA. Starting off as a simple live cypher in 2023, the program has evolved to include artist and songwriter workshops, competitions for cash prizes, and headlining performances by local legends. Putting the art of lyricism at the forefront, this is an event for emcees who actually want to rap, and for those who proudly claim Mississauga in a climate where it’s more marketable to say you’re from Toronto.
Past years’ River Mouth showcases have taken place at The Rec Room Square One, with headliners including Junia-T and Rich Kidd. For the 2026 edition, River Mouth IV would take place at a relatively new venue called The Wildflower, and would be headlined by the duo RUNXGUN, made up of the emcees J.O. Mairs and Heavy G (f/k/a Gudini). RUNXGUN have been making music for a few years, both as individual solo artists and as a duo, and they’re coming off of releasing their latest album this past summer, Contra III: Alien Wars. Having seen them make short appearances at other artists’ shows over the years, including opening for D-Sisive back in 2023, this would not only be a rare opportunity to see RUNXGUN perform a headlining set but also a chance to take in some new music performed by local emcees.
‘Sauga’s own Rich Kidd would be working the turntables as The Wildflower slowly filled up with artists and fans alike. Seeming to be a restaurant by day and lounge by night, the event space had a stage set up in the middle, with VIP booths on the upper level behind it and an open floor around it, giving lyricist lounge vibes. Hosting for the evening would be Testament, who’d get things started by introducing The Cook Up segment of the showcase, which featured artists from Gho$Town Records performing new songs they had recently recorded during a song camp held at MetalWorks Studios. The label’s founder and lead producer GhostBoyRJ would take over the turntables, and one by one emcees including Sport Mathews, Imadh, Dexray, Crooks, Joey Rose, and Fenifina would rock the mic, each performing tracks solo and some even performing collaborations with their fellow artists.
Each artist had their own unique style, with Sport Mathews, Imadh and Dexray getting heads nodding to their flows, Crooks using his deep vocals to blend the Rap with R&B, Joey Rose hyping up anyone he shared the stage with, and Fenifina blending sounds, languages and styles with her Mumbai roots, although making it clear she was representing Scarborough. GhostBoyRJ would close out the segment by coming down to the stage himself to perform a few songs, getting some engagement from the crowd as he had us joining in on the hook for his song.
Following the performances by the emcees would be a beat showcase, with producers Neusun and Pudgegawd each getting a few minutes on the turntables to play some of their instrumentals and remixes. There would be a couple t-shirt giveaways for the crowd, and the producer showcase would flow right into a b-boy showcase, with Dxgree taking over the turntables with his own production to back the Ground Illusionz crew as they formed a dance cypher on the floor. Taking it back to Hip-Hop’s roots, each member of the crew got busy and tore up the dance floor with their breakdance moves.
Next up would be what’s become known as a highlight of the River Mouth showcase, and that’s the live cypher. Four emcees would compete live for a $500 cash prize, each getting to perform a written verse, and would get judged both by the fans via voting on our phones and by a panel of judges looking at criteria including breath control, musicality (flow), lyricism and energy. An alumni of the cypher, RUNXGUN’s own J.O. Mairs would supply the beat with an original production, and emcees Lowercase, Gritfall, Spenny, and the 2025 champ Scarz1 would each spit a verse. While each emcee did their thing, Spenny would eventually get voted the winner by the end of the night, as he came with a fast-paced, rapid-fire flow and had the most energy.
Before tallying up the votes to crown the winner of the cypher, it would be time for RUNXGUN to take over the stage with their headlining performance. The duo would come out to their 2021 track “All You Need,” letting the Seals & Crofts “Summer Breeze” sample used to make the beat breathe a bit more than how you hear it on the record. Between the way the sample was flipped to make the beat and the lyrical interpolation of Jay-Z’s “All I Need” on the hook, the crowd was immediately drawn in. RUNXGUN’s Jay-Z influence and J.O. Mairs’ underrated ear for samples would be on display throughout the set, as they’d later on perform the 2024 track “Where The Love Go,” with sharp listeners picking up on the same sample used on Hov’s “Politics As Usual.”
Although RUNXGUN’s discography is newly built from the 2020s for the most part, it felt like they had a large body of work to take the fans through, as they pulled from projects like Crash Dummy II with the track “Who Hurt You,” RXG SZN II for the aforementioned “Where The Love Go,” and they even took it back to the year 2020 with cuts off of the very first Contra EP, including “Stretch Four” and “Air It Out.” Heavy G and J.O. Mairs would often step off the stage to perform their verses among the crowd, and they’d feed off of each others’ energy on the mic, backing up each others’ vocals with precision. They’d of course also pull out new joints off of the Contra III album, adding “Gusto” and “Problem” to their setlist, and closing out their performance with the album’s intro, “Gather Round,” which includes another Jay-Z nod with the beat interpolating “1-900-Hustler.”
With this being my first real deep-dive into RUNXGUN’s music, I found the duo stood out with their beats, mostly from J.O. Mairs’ ear for catchy samples in his production. On stage, they command your attention with the way they go back and forth on the mic, nailing each verse and getting the crowd engaged with their hooks. It’s especially dope seeing J.O. & Heavy G go bar-for-bar on some tracks, similar to a Styles P & Jadakiss dynamic.
The River Mouth showcase would conclude with Spenny being crowned the 2026 cypher champion, winning both the audience and judges’ votes, followed by an open-mic cypher kicking off for any emcees in the building to participate in. Overall, the event is a dope way to tap in to the local scene and see what Mississauga’s artists have going on. The spirit of Hip-Hop was definitely felt, as emcees, DJs, producers and b-boys all got a piece of the spotlight to celebrate their art, and it brought back the tradition of both dance and rap cyphers bringing artists together. It also brought that sense of competition with the cash prizes and emcees needing to prove their ability live on stage.
River Mouth proved to be an event that proudly supports Mississauga’s music scene, and they’ll be looking to do things even bigger next year for their 5th anniversary. Tap in and get connected at rivermouth.ca.
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