storytimeeee one day as goku is training he met a stranger, goku said: heya! are you strong? the starnger said uhhh a little bit😅 and then goku said alright im going to train you?
The drums are how you can tell it is, in fact, the GT version of the Genkidama theme (specifically from the Japanese version, which all around had a better OST). The one that's almost all strings is SSJ4, and the rock ballad from the Japanese opening is the original version of the song.