Plant it to grow Sheet Music: Repeat End. This marks where your song should repeat a section. The music marker will jump back to the most recent Sheet Music: Repeat Begin that's in the same row (or the beginning of the song if not). If you need to repeat a section more than once, put Repeat pairs in multiple rows.
Sheet Music: Repeat End Seed price in Growtopia: sells for about 25/WL (median of 1 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: 29EL