Your tab https://www.gametabs.net/crash-bandicoot/main-theme
Fixed a couple parts. Most notable is the half steps (the D4-D5-D4-D5) on the first section. And I changed it to guitar, since most people who are looking for the main melody will likely want that. If they see it labeled as a bass tab, they might think it's a transcription of the bass part, not the lead melody and not look at it.
So I moved some notes to work better on guitar, but if you're friend wants it on bass, show him this version: Crash Bass.txt (2.4 KB)