Orange County Restaurant With Live Music
Salt Creek Grille in Dana Point has jazz. They usually have a calendar on their website, but I just checked and the new calendar hasn't been posted yet. You could probably call them for the info. The food is decent and the service is excellent.
32802 Pacific Coast Highway
Dana Point, CA 92629
Sejour in Newport Beach in Lido Villlage has live music and a cool vibe. It has been awhile since I have been though. I would call and ask. www.sejour.us
Bayside has live jazz brunch on Sundays.
FYI the live music at La Cave is not in the dining room but in a seperate room off the the side. The Frank Sinatra impersonator is supposed to be amazing.
Both Mastros Ocean Club and Steak house have live music in the bar.
Villa Nova has a very large piano bar with live music. Eat dinner elsewhere though.