ESG first emerged in the late 70s and excels at the kind of joyous, polyrhythmic pop confections that are perfect for dancing and sampling. But as the title of one postreunion 1992 EP says, Sample Credits Don’t Pay the Bills. While a whole generation of hip-hop and indie-dance artists has amassed piles of cash on borrowed beats, the Scroggins sisters are still scrabbling to get by–and to keep playing. Drummer and former MTA worker Valerie Scroggins is embroiled in a workmen’s comp case; if she’s well enough to drum, they say, she’s well enough to drive a bus. She’s sitting out this show. The lineup will be anchored by two original members, singer and guitarist Renee Scroggins and bassist Leroy Glover, and rounded out by two Scroggins daughters. Tonight’s performance is a part of Estrojam (complete schedule, page TK), which is billing this as ESG’s last show ever. Let’s hope not. The bill, from top to bottom: ESG, Yo Majesty, Bahamadia, Psalm One, Rita J. a 8:30 PM, Abbey Pub, 3420 W. Grace, 773-478-4408 or 866-468-3401, $20, $75 for a festival pass, 18+. –Monica Kendrick