How many songs are on rock band?

Main List 45 - Bonus List 13
All are listed below.

The main setlist consists of the following 45 songs:
"Are You Gonna Be My Girl" 鈥?Jet
"Ballroom Blitz" 鈥?Sweet
"Black Hole Sun" 鈥?Soundgarden
"Blitzkrieg Bop" 鈥?Ramones
"Celebrity Skin" 鈥?Hole
"Cherub Rock" 鈥?Smashing Pumpkins
"Creep" 鈥?Radiohead
"Dani California" 鈥?Red Hot Chili Peppers
"Dead on Arrival" 鈥?Fall Out Boy
"Detroit Rock City" 鈥?Kiss
"(Don't Fear) The Reaper" 鈥?Blue 脰yster Cult
"The Electric Version" 鈥?The New Pornographers
"Enter Sandman" 鈥?Metallica
"Epic" 鈥?Faith No More
"Flirtin' with Disaster" 鈥?Molly Hatchet
"Foreplay/Long Time" 鈥?Boston
"Gimme Shelter" 鈥?The Rolling Stones
"Go with the Flow" 鈥?Queens of the Stone Age
"Green Grass and High Tides" 鈥?The Outlaws
"The Hand That Feeds" 鈥?Nine Inch Nails
"Here It Goes Again" 鈥?OK Go
"Highway Star" 鈥?Deep Purple
"I Think I'm Paranoid" 鈥?Garbage
"In Bloom" 鈥?Nirvana
"Learn to Fly" 鈥?Foo Fighters
"Main Offender" 鈥?The Hives
"Maps" 鈥?Yeah Yeah Yeahs
鈥滿ississippi Queen" 鈥?Mountain
"Next to You" 鈥?The Police
"Orange Crush" 鈥?R.E.M.
"Paranoid" 鈥?Black Sabbath
"Reptilia" 鈥?The Strokes
"Run to the Hills" 鈥?Iron Maiden
"Sabotage" 鈥?Beastie Boys
"Say It Ain't So" 鈥?Weezer
"Should I Stay or Should I Go" 鈥?The Clash
"Suffragette City" 鈥?David Bowie
"Tom Sawyer" 鈥?Rush
"Train Kept A-Rollin'" 鈥?Aerosmith
"Vasoline" 鈥?Stone Temple Pilots
"Wanted Dead or Alive" 鈥?Bon Jovi
"Wave of Mutilation" 鈥?Pixies
"Welcome Home" 鈥?Coheed and Cambria
"When You Were Young" 鈥?The Killers
"Won't Get Fooled Again" 鈥?The Who

A total of 13 bonus songs are available for unlocking in the game.

"29 Fingers" 鈥?The Konks
"Blood Doll" 鈥?Anarchy Club
"Brainpower" 鈥?Freezepop
"Can't Let Go" 鈥?Death of the Cool
"Day Late, Dollar Short" 鈥?The Acro-Brats
"I Get By" 鈥?Honest Bob and the Factory-to-Dealer Incentives
"I'm So Sick" 鈥?Flyleaf
"Nightmare" 鈥?Crooked X
"Outside" 鈥?Tribe
"Pleasure (Pleasure)" 鈥?Bang Camaro
"Seven" 鈥?Vagiant
"Time We Had" 鈥?The Mother Hips
"Timmy and the Lords of the Underworld" 鈥?Timmy and the Lords of the Underworld

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ONE

The main set list consists of 45 songs.
http://en.wikipedia.org/wiki/List_of_son...

Not including bonus songs and downloadable content? 45. 13 bonus songs, and eventually potentially unlimited downloadable content.

I am assuming you mean the game 'Rock Band'. There are 58 songs on the game disc and in the future you will be able to download others.