This is really sad news:
I’ve been a big Leonard Cohen fan since I was a teenager in late 1960s California.
I came to know him first through his 1967 album Songs of Leonard Cohen.
Here are two of the Cohen songs that I first learned (and often played myself):
This is another favorite from that 1967 album:
And here he is in 2009, an elderly man in London, performing one of his best-known pieces: