It can come from any medium.

Now, to all anime fans: remember "Revolutionary Girl Utena"? Well, think of the opening song, "Rinbu Revolution".

That tune, IMHO, can represent any major West Coast city north of LA, not inclusive. (The best fit would probably be SF.) I can imagine Utena strolling the streets of Toronto or Montréal to the beat of "Rinbu Revolution", too.

Kraftwerk / Metropolis, for multiple cities (while entering the city). ;)

Ghetto Cry/ Birmingham
Simply The Best/ London

funkytown / los angeles :D

City of joy - Kolkata

Days Go By (Keith Urban) for Atlanta....seems to represent some of the city's "go-getter" spirit.

Otherwise, I'd pick that "Cars" song from the 1980's for ATL.
..."Here in my car, I feel safest of all"
..."I can lock all my doors, It's theonly way to live.......In Cars (techno beat solo)"

play the game - dubai
or sim city 200x - dubai :D

Riviera of the midwest- Milwaukee!