Solution for "Time-Travel Tour"

The secret to this puzzle lies in the encoding used to enter the destinations on the keypad. This was hinted at greatly in the footnote.

The encoding is the 2-letter building codes (BB, GC, etc.). Using the Mines campus map, the destinations shown on the puzzle can be translated to this sequence of building codes:

GH -> EH -> CO -> HH -> WA

Entering this on a telephone keypad would produce this sequence of digits:

4434264492

Conveniently, this is also a valid US telephone number. Calling this number plays the song "Time" by Izabo. So the answer is "Izabo".