SpongBob's neighbor and co-worker, Squidward, plays very
bad, very loud, clarinet.

Meanwhile, the incidental music to the cartoon is a sublime
mix of melodeon and concertina tunes, ranging from Irish to
Morris. As the series has gone on, the repertoire has
expanded. But there's this one hornpipe they play that
is absolutely brilliant. I 'had' it for a while on English
concertina, but it's slipped out of my memory, now.

I wish they'd release a soundtrack album with all the incidental
music in full, artists credited.