Two stage multi. The first stage (at the posted coordinates) has a puzzle which must be solved on site, but there's a big hint there if you get stuck.
Say you don't know me, or recognize my face
Say you don't care who goes to that kind of place
Knee deep in the hoopla, sinking in your fight
Too many runaways eating up the night
Marconi plays the mamba, blah blah I forget what comes next
Don't you remember?
We built this city 8890000
We built this city on rock and roll!
We built this city, we built this city on rock and roll
Built this city, we built this city on rock and roll
Big thanks for pcc322 for maintaining the cache.