One of my favorite bands is the Electric Light Orchestra.
They released eleven studio albums between 1971 and 1986, and had a great DVD called ZOOM that featured many of the older songs plus some new releases.
For more info on ELO, see this Wiki link.
To find the correct coordinates for this cache, listen to this clip of six ELO songs.
A=A-1
B=B
C=C+2
D=D+3
E=E
F=F+5
Coords: N38 25.ABC W121 26.DEF
You can check your answers for this puzzle on Geochecker.com.
Example:
If the first song title was "I want to hold your hand", A would equal 6.
If the second song title was "Yellow Submarine", B would equal 2.
If the third song title was "Do you want to know a secret", C would equal 7.
If you are still having problems understanding this (or can't figure out the song titles), drop me an email and I'll be glad to help.
ALERT: As the cache owner, I represent that the audio file referenced above is safe to access although it has not been checked by Groundspeak or by the Geocache Reviewer for possible malicious content. As a result, you are accessing this file at your own risk.