In high school in the mid-80s, I became a big fan of the group
Big Daddy, which was one of the first mashup groups. They pretended to be a 50's doo-wop group, and said that they had written the original versions of the songs that were current hits in the 80s. They got radio play with a combination of Sussudio and Runaround Sue.
I was singing in my high school a cappella group at the time, and there was a great cover of "Do You Really Want To Hurt Me?" on their album. So, I wrote to them, said how much I liked their music, and that I wanted to get the sheet music for their arrangement.
I got back (1) a signed group photo, (2) a two-page handwritten letter, and (3) a cassette tape. The cassette tape started off "Hi (my name), this is Dave. Sorry about the quality of the tape, but it's all I had handy. OK, here's the bass part...", then he put each individual track down on the tape. I've lost the letter and photo, which pisses me off, but I still have the tape.
Moral: become fans of little groups. They really appreciate being noticed.