The guide, Lylo, shows the venues by arrondisements. I was in the 5th, so I decided this was the night to do the Latin Quarter. I tried le Petit Journel St. Michel, but it was a trad/modern jazz band from Ireland. I can see a higher level of that any time.
I went to Caveau De La Hauchette because it was local musicians. That's a fun place. Couples go there to dance. I liked the band. 2 tenors, drums and bass. It was fun. I stayed for a few and called it a night. I'd been out all day and it was after 11.