Songs that have stood the test of time.

"Hallelujah"---great choice! I heard Leonard do it live in concert (if you have a chance to see him live, do not miss it!), but my favorite version remains the one by Rufus Wainwright. Transplendent ;-) !

Hey @thepigdog 

Found that song All Along The Watchtower on Tidal on the Nod To Bob compilation.

Another great version. Thinking it could've been on the The Departed soundtrack or inspired a Mumford & Sons version. Thanks for pointing me in yet another direction!

And, of course, Hallelujah. Why didn't I think of that? Great song no matter who covers it. 

My favorite Hallelujah is by Puddles the Clown.  Not everyone's cup of tea, I'm sure.

Gimme Some Lovin' - Spencer Davis Group. It's been covered at least 65 times; but nothing comes close to the original. THE definitive rock song!

Hallelujah has got to get a mention, I agree. Jeff Buckley's version on SACD gives me chills.

I didn't see any votes for Hey Joe. I have 13 versions of that, Black Cat Bone being my Fav, but Hendrix' is the classic.

 I also have 15 versions of Morning Dew; but that's just me.

I'd also have to say that Janis Joplin singing Piece of My Heart never gets old; but probably the number one long lived hit is Mack The Knife by Bobby Darin.

Somewhere Over The Rainbow never gets old, and always compels me to listen.