4’33 by John Cage.
U2, “Where the Streets Have No Name”.
What I came in to say.
Roundabout by Yes, which fades in on a backwards-running grand piano chord, (I only recently had that pointed out to me).
The Beatles and Kinks have already been mentioned. I’ll go with
Space Oddity - David Bowie
Karn Evil 9, First Impression, Part 2 from ELP. song continued from side 1 to side 2, the transition made by fading out a synth sequence at the end of side 1 and fading it back in at the start of side 2. If you’ve only heard the album on CD it’s kind of “WTF?”
Yes :eek:! Of all the great songs mentioned here, “Shine On You Crazy Diamond” [Parts I-V] AND [Parts VI-IX] on Side Two of Floyd’s “Wish You Were Here” album are 2of THE greatest, most dramatic uses of fade-in. They did it on “One Of These Days” from the “Meddle” album too, & “Dogs” on “Animals” but “Shine On…” stands above 'em all! 
This.
I don’t even like U2, but that is a bad-ass intro.
“Mountain Jam” - Allman Brothers. They couldn’t fit the song on At the Fillmore East, so they just faded it out at the end. Then they faded it in on Eat A Peach.
+1
I’ve also always liked the layered entrances on “Magnificent”, though I know that a lot of fans and critics aren’t as fond of that particular album.
(The video is pretty amazing as well.)
Fleetwood Mac’s Station Man. Less than 40 seconds but sets up the rest of the song.
…a bunch from Van Halen /Van Hagar: ‘Hot for Teacher’, ‘Right Now’, ‘Finish What Ya Started’, ‘Runaround’ and ‘Poundcake’ (that features a ‘Frankenstrat’ painted electric drill used on Eddie’s guitar strings).
I Want To Tell You – The Beatles
Echoes – Pink Floyd
Except… none of those are fade-ins…
“Hot for Teacher” - starts right in with the infamous drum intro.
“Right Now” - starts right in with the piano
“Finish What Ya Started” - starts with Alex counting them in "One- Two, One-Two-Three-Four.
“Runaround”- starts immediately with the G-A-G-D riff
“Poundcake” - doesn’t fade in either, it starts with a Makita 9-volt cordless drill motor hovering over the DiMarzio Custom Humbucker bridge pick-up of an Ernie Ball Music Man guitar. No FrankenStrat at all.
FTR, he had drill and guitar painted his signature red, white, and black striped pattern for the video. He kept the drill, but I have never seen that particular guitar again.
Yeah, you said it!