Any nice music stores?

Hi everyone.
Later this spring (in may) I’m going to the states, San Fransico and Las vegas to be precise. Are there any music stores worth visiting? I dont know why but I love visiting music stores :wink:
Also, if you know any nice pubs, bars or other places that use to have good live music please let me know. I can only take so much of DJ:s and heavy base beats that makes your heart change rythm. I might need to go somewhere were I can wash my ears with real music.
Mattias