The drinking hour comes early to Nob Hill Inn, where the alcohol starts flowing at 8 a.m. and doesn't stop 'til 2 a.m. This Colfax dive welcomes all comers -- from day laborers on their way to work to night-shifters knocking back a quick one before bed. But it has a strict zero-tolerance policy for those folks involved in the brisk Colfax street-drug trade, which is why it blasts classical music from a speaker system mounted on the tavern's outside wall. Though classical music has been shown to increase brain activity in young children, it's apparently a powerful weapon in the war on drugs. Forget DARE: Nob Hill fights rock with Bach -- and Tchaikovsky, Mozart and Chopin.