When The Beatles released “Something” as a single backed with “Come Together” in 1969, it was significant for a number of reasons. For George Harrison, it was the first time the band released a song he wrote as a single (i.e., the A side).
When it hit No. 1 on the Billboard charts that November, it became the first time someone besides John Lennon or Paul McCartney had got the Fab Four there. (It was also the last time.) And the praise for “Something” began rolling in right away.
Before Frank Sinatra began singing it at his shows, he’d call it one of the best love songs ever written. But even Sinatra was confused about the composer. (At first, he attributed it to Lennon and McCartney.)
Fifty years later, it remains one of the most popular and most covered Beatles tracks. However, it’s still not entirely clear who George was thinking about when he wrote his greatest love song.
Source: cheatsheet.com