To complete in these challenges belonging to Fortnite's Boogie Down of Season 10 mission, you will need to find the giant piano for the normal mode challenge, and then play the score found there for the prestige mode. The piano in question is located on the coast slightly southeast of Lonely Lodge.
Piano location
Map
Score location
The score is right in front of the piano which will allow you to play the sequence of notes that are requested quite easily. All you have to do is to place yourself on the notes indicated on the score one after the other without making a single mistake to complete the challenge.
