From Video Game Music Preservation Foundation Wiki
Follow is the song from Xargon. It plays in "Forest of Enchanted Trees" (level 3) and in "Mysterious Corckscrew Cave" (level 7) of "Beyond Reality" (episode one) and in "Another Erupting Volcano" (level 5) of "Xargon's Fury" (episode three).
The song is contained in the SONG_3.XR1 and SONG_5.XR3 (the last digit in the file extensions is the number of the episode using the song). Both files are identical.