The "Goblin Song" is sung by Finn in the episode "The Silent King." He sings it after seeing how the goblins did not trust him, making it difficult for Finn to help them since they stuck to Xergiok's rules.
| I just wanna help y'all as much as I can,|
but y'all just keep showin' me your goblin hams.
| When I became king, I didn't think y'all'd show me your rears,|
But I'll accept my boring fate and shed this tear
'Cause I can't seem to cure you of your groundless fears.
- Official upload - https://soundcloud.com/adventure-time-official/goblin-hams