Hidden Song
Go to Challenge Mode and choose any of the song length choices. On the final song you get to play the song Na Na Hey Hey Kiss Him Goodbye. This is the only Mode you can play this song in.

Unlock Donkey Konga 1 Soundsets
Save on the same memory card that has your Donkey Konga 1 Files

Unlockables
Dixie's Notes 3 - Purchase all the Gorilla arrangements from the Shopping Mall.
Dixie's Notes 2 - Collect at least one of each badge.
Dixie's Notes 4 - Earn a gold DK on each Gorilla duet arrangement.
Dixie's Notes 5 - Earn a gold DK on each solo Gorilla arrangement.
Dixie's Notes 6 - Complete the Full Set in Challenge mode.
Dixie's Notes 7 - Earn a gold DK on each Chimp duet arrangement.
Dixie's Notes 8 - Earn a gold DK on each solo Chimp arrangement.
Dixie's Notes 9 - Complete the 12-Song Set in Challenge mode
Dixie's Notes 10 - Earn a gold DK on each Monkey duet arrangement.
Dixie's Notes 11 - Earn a gold DK on each solo Monkey arrangement.
Dixie's Notes 12 - Complete the 6-Song Set in Challenge Mode.
Echo Feature in Freestyle Zone - Unlock Dixie's Notes 76 (clear at least 325 songs).
Na Na Hey Hey Kiss Him Goodbye in Freestyle Zone - Complete the Full Set in Challenge mode.