My First Born For A Song Lyrics

Lyric discussion by narcissus_t 

Cover art for My First Born For A Song lyrics by Bell X1

Actually, I think it is "cross his palm", and, despite the song title, I think what follows is "my first born with a song." As in, this is the exchange he's making with the king, you know?

Isn't the exchange "my first-born for a song"?