The beginning of the Hill Street Blue opening credits always reminded me of Adam-12 intro. You get the VO of the police dispatcher listing occuring crimes, but instead of the driving forceful music that you expect from a police show (and what you got from the Adam-12 intro), you get his mellow tune that completely messes with my expectations.
The theme tune was written by Mike Post and features Larry Carlton on guitar. The song was popular enough that it reached #10 on Billboard’s Hot 100 music chart. Post is a prolific tv tunesmith composing well know music for shows like as Law & Order, NYPD Blue, The Rockford Files, LA Law, Quantum Leap and site favorite Magnum, P.I.