For me:
Wow I totally embedded this thread wrong. Now I gotta fix it.
Here are a few of mine though: https://www.youtube.com/watch?v=ptpyWR7O60M - MArio Land theme
https://www.youtube.com/watch?v=31ivdML1Xes - PS1 opening
https://www.youtube.com/watch?v=e4XCk2HFdNc - Aquatic Ambience from DKC