I don’t go often to these places but they’re cool:
La Rubia (Instagram)
Rai (Born)
La Rouge (Raval)
Big Bang bar
Robadores 23 (jazz, flamenco)
New fizz
Tarantos (flamenco)
Craft Barcelona
Jazzsi (Instagram)
Club de jazz and music school, a big reference un Barcelona. They have shows almost everyday. Check their Instagram page for the program and contact them to book your spot