What notes you looking for?

The hardest notes for me at least are 17, 44 and 45. I personally prefer 17 to the other two given you can get the same note drop in Dalraidia from that 3rd chest before you get the one you want. Yes some are a pain like 11 and 14 but they will drop eventually.

I've got 5 bikes so I've been through the slog more than once.