There’s No Business like Show Business
I think Video Killed The Radio Star counts.
No mention of movies there – the time frame for Annie Get Your Gun was before movies existed.
“My Brother Makes Noises for the Talkies” by the Bonzo Dog Band
“Hooray for Hollywood” is all about moviemaking.
“I’ve Seen That Movie Too” - Elton John (and Bernie Taupin)
“Peg” - Steely Dan
“Pictures of Lily” - The Who
“Centerfold” - J. Geils Band
“I’ll Wait” - Van Halen
“Take Your Girlie to the Movies” (1919)
http://www.youtube.com/watch?v=UJYJg9b6gJI
“At the Moving Picture Ball” (1920)
http://www.youtube.com/watch?v=HMvOv-_AUcc
“Ever Since the Movies Learned to Talk” (1928)
http://www.youtube.com/watch?v=0cmdlV5gNwg
“I Can’t Sleep in the Movies Anymore” (1929)
http://www.youtube.com/watch?v=FbPAPXFWs38
“There’s Always a Happy Ending” (1936)
http://www.youtube.com/watch?v=4zHjS3COO9E
Steely Dan - “Show Biz Kids,” though the lyrics aren’t quite cut and dried. On the other hand …
… is about the dirty old man next door showing porno to the kids in the neighborhood.
In Rock On, David Essex breaks off from describing the prettiest girl he’s ever seen – seen her shake on the movie screen – to mention JAMES DEAN all in capitals just like that.
(Speaking of which, how about We Didn’t Start The Fire for quickly slotting Ben-Hur and Lawrence of Arabia and Bridge On The River Kwai into the timeline?)
“Key Largo,” Bertie Higgins
Madonna - “Vogue”
“Family Snapshot” by Peter Gabriel (loosely interpreted)
Thought of a few more:
“Picture This” - Blondie
“Makin’ Movies” - Dire Straits
“Wishing (If I Had a Photograph of You)” - A Flock of Seagulls
Also, while I wasn’t exactly asking for songs about actors & actresses, I’m shocked that “Candle in the Wind” by Elton John hasn’t been mentioned!
The title of the album is Making Movies. The song you’re thinking of is “Skateaway.” That’s a great Dire Straits song. 
“Steve McQueen” - Drive-By Truckers (NSFW lyrics!)
“Stereophonic Sound” from Silk Stockings, sung by Patti Page and Fred Astaire. Written by Cole Porter. It’s a sendup of all the gimmicks that movies were using to draw viewers away from their TV sets.
“…If you wanna get the crowds to come around,
You gotta have
Glorious Technicolor,
Breathtaking CinemaScope and
Stereophonic Sound.”
I think this film had all those things.
Roddy
James Dean-Eagles
“Love Like the Movies” - The Avett Brothers
“Old Pictures” - The Judds