PHOTO BY JACOB WALSH Formerly an instrumental band, FRAN has turned a corner with singer Jon Lewis (center) as frontman. The last time I saw Rochester singer-songwriter Jon Lewis perform, pre-pandemic, he was behind a mic stand with guitar in hand, fronting the band that bore his name with a smile that was both confident and sheepish. Fast forward to a chilly late-April evening at Flour City Station on East Avenue, and the affable musician is still smiling. This time, however, there’s a microphone cord slung over his shoulders where the guitar strap once was, as he sings in front of an entirely different group of musicians with a similarly no-frills moniker, FRAN.