He called the piano tuna!
Because he higher and higher. (I translated the joke from Dutch, and yeah it's supposed to not make any sense, it just sounds funny, in Dutch at least. :-$)
kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
His grades were below sea level
Better get this right, I only have 2 worms.
A flat note.
Tulips on your organ.