What was the first soundtrack you ever bought

When I was 11, I bought a cassette of the soundtrack of The Sting. It was the first time I'd heard of Scott Joplin and his music (the theme from the film, "The Entertainer," was a Top 10 hit on the radio at the time), and I played it over and over again. I still have the tape; even though it's from 1973, it still plays well.