you didn't know who wrote them. For many years I thought Jimi Hendrix was doing a cover of Bob Dylan's The Wind Cries Mary. Turns out Jimi wrote the damn thing! I could even hear Bob singing it in my head!
shareBefore getting into baroque music, I thought the famous Albinoni's Adagio was composed by Albinoni. It turns out it was composed in the XXth century.
shareA early 1980's American hit 'Cum on feel the noise' from Quiet Riot.
Originally a hit by Slade in the 1970's
Didn't know this until about 5 years ago.
Not my favorite song in the world, but I NEVER heard the original song played on the radio or seen the music video in the US until I came across it in 2015.
Strange because it was a huge hit in the UK.