Fall is truly here, heralded by the return of crisp (read: flipping cold) fall weather and return of coat check to the 9:30 club. Yet southern bands Jonezetta and Mute Math received a warm welcome from their overwhelmingly youthful audience at Thursday’s early show.

The night’s opener was Mississippi’s Jonezetta, an energetic quartet who demonstrated affinity for the kick drum and fuzzy guitar. On their web site the band claims to be intelligent, danceable pop in the style of Franz Ferdinand. Live Jonezetta sounds like the Scottish group as covered by the All-American Rejects. Their songs reflected their youth, with single word titles like “Backstabber” and “Popularity,” containing a particular brand of outrage that especially speaks to adolescents.

Though the songs were aurally indistinct, all were enjoyable and the band ripped into each as if discovering it for the first time. Between songs the band’s manner was refreshingly unassuming. Their onstage banter consisted of deadpan statements followed by a half-mumbled “that’s cool.” (This was much more endearing than it sounds.) While musically having room to grow the band delivered a fairly satisfying opening set.

As for Mute Math—wow, just wow. Their set had you thinking almost wholly in interjections. “Dude!” — for when the drummer secured his head phones with gaffer tape. “Sweet Lord,” as lead singer Paul Meany attempted hand stands while playing the keyboard. A “Holy [insert expletive here]” at the appearance of a Keytar.