Home Jambase Marc Brownstein Sits-In With Umphrey’s McGee In Philadelphia – Photos & VideosNational Music NewsJambaseMusicMarc Brownstein Sits-In With Umphrey’s McGee In Philadelphia – Photos & VideosOctober 22, 20161631FacebookTwitterPinterestWhatsApp UM welcomed local bassist Marc Brownstein of the Disco Biscuits to the stage last night at The Fillmore.