I've currently got over 14,000 unique Christmahannukwanzaakahmasolstice tracks and it's hard to collect new music that isn't just a re-release of something I have.
Covers by a different artist are perfectly acceptable - I have over 100 covers of "Last Christmas" including ones in sung in Japanese, Tagalog and Thai, played on a ukulele in Hawaiian Slack Key style, and more.
