A 10 minute loop of the Cave (Area 1) theme from the 2008 freeware version of Spelunky.
This track's melody can be heard in Spelunky HD's deathmatch mode about a minute in.
Composed by George Buzinkai and Jonathan Perry.
(A quick thank you to Buzinkai - who passed away back in 2018 - for creating such an iconic track for the original game. May you rest in peace.)