I honestly always forget about the backing track thing they have. they are tons of backing tracks on youtube and some even tell you which key its being played in and what might work well over it for a lead melody.
I have like 4k hours if I combined the time before it dropped on pc and was only on console lol. destiny2 is in alul right now because of the expansion delay . They are going to have a "fun event" coming reset on tuesday. might log back in.