I came across this post from Jesse Saunders explaining how he got started with mixing records. The whole story is a great read, but this is what struck me:
"One day while sitting in my living room, I flipped the record over to check out the B-side and found a bootleg mashup. This song used the bassline from Player One’s “Space Invaders,”► the “toot toot, heeeeey, beep beep” refrain from Donna Summer’s “Bad Girls,”► and the horns from Lipps Inc’s “Funkytown.”► It was called “On & On” and I knew right away that it was special. The first time I played it in a set, it created such a frenzy on the dancefloor that I immediately made it my signature record, using it as an intro every time I DJed. Looking back, it was probably the first mashup ever created.
Unfortunately — or fortunately, now that I have the privilege of hindsight — it was among a number of vinyl records stolen from the booth at The Playground. While I was devastated at the time, that record thief gave me all the inspiration I needed to create my own version.
I quickly found myself in my bedroom at 7234 South King Drive, piecing the elements of my prized record back together on a Tascam 4-track cassette recorder. I also began to see this as opportunity to take the original “On & On” and expand upon the things that made it great, fleshing it out into a more fully-formatted song. I banged out new drum programming on my TR-808; my songwriter buddy, Vince Lawrence, wrote the lyrics and the melody"
Sometimes, you're forced to create what you need, and thats a beautiful thing.