Rock Band Downloadable Content Analysis

So, in the bastard son follow up of my Virtual Console article, I am now doing the 'Rock Band DLC' article that I mentioned.
Here is the list of all the songs I have on Rock Band...by year (I had to have some way of differentiating them. Also, I have a very boring job, so this kills a lot of time)
* represents cover

1960s (1)
"Last Train to Clarksville" by the Monkees*

1970s (29)
"N.I.B." by Black Sabbath*
"Sweet Leaf" by Black Sabbath*
"War Pigs" by Black Sabbath*
"Hitch A Ride" by Boston
"More Than A Feeling" by Boston
"Peace of Mind" by Boston
"Rock & Roll Band" by Boston
"Smokin'" by Boston
"Something About You" by Boston
"Ever Fallen In Love?" by the Buzzcocks*
"Complete Control" by the Clash
"I Fought the Law" by the Clash
"Fortunate Son" by Creedence Clearwater Revival*
"Heroes" by David Bowie*
"Moonage Daydream" by David Bowie
"Queen Bitch" by David Bowie*
"Casey Jones" by the Grateful Dead
"Sugar Magnolia" by the Grateful Dead
"Cheeseburger in Paradise" by Jimmy Buffet
"Margaritaville" by Jimmy Buffet
"Volcano" by Jimmy Buffet
"My Sharona" by the Knack*
"Can't Stand Losing You" by the Police
"Message in a Bottle" by the Police
"Roxanne" by the Police
"Teenage Lobotomy" by the Ramones
"Working Man" by Rush*
"Action" by Sweet*
"Bang A Gong (Get It On) by T. Rex*

1980s (20)
"Call Me" by Blondie
"Roam" by the B-52s
"Jukebox Hero" by Foreigner*
"The Number of the Beast" by Iron Maiden*
"Crackity Jones" by the Pixies
"Dead" by the Pixies
"Debaser" by the Pixies
"Gouge Away" by the Pixies
"Here Comes Your Man" by the Pixies
"Hey" by the Pixies
"I Bleed" by the Pixies
"La La Love You" by the Pixies
"Monkey Gone to Heaven" by the Pixies
"Mr. Grieves" by the Pixies
"No. 13 Baby" by the Pixies
"Silver" by the Pixies
"Tame" by the Pixies
"There Goes My Gun" by the Pixies
"Synchronicity II" by the Police
"Limelight" by Rush*

1990s (10)
"All The Small Things" by Blink-182
"Don't Look Back in Anger" by Oasis
"Wonderwall" by Oasis
"My Iron Lung" by Radiohead
"Siva" by the Smashing Pumpkins
"Zero" by the Smashing Pumpkins
"Interstate Love Song" by the Stone Temple Pilots
"Sex Type Thing" by the Stone Temple Pilots
"Buddy Holly" by Weezer
"El Scorcho" by Weezer

2000s (18)
"Attack" by 30 Seconds To Mars
"The Kill" by 30 Seconds to Mars
"Dirty Little Secret" by the All-American Rejects
"Move Along" by the All-American Rejects
"Rock Rebellion" by Bang Camaro
"Ten Speed (Of God's Blood and Burial) by Coheed and Cambria*
"Shake" by Count Zero
"Sprode" by Freezepop
"Still Alive" by GLaDOS
"Hysteria" by Muse
"3's and 7's" by Queens of the Stone Age
"Little Sister" by Queens of the Stone Age
"Sick Sick Sick" by Queens of the Stone Age
"Song With A Mission" by the Sounds*
"Dreamin'" by Weezer
"The Greatest Man That Ever Lived" by Weezer
"Troublemaker" by Weezer
"Joker and the Thief" by Wolfmother

I have a grand total of 78 downloadable songs. That means that, for all of Rock Band, I have spent over $300.
I spend a lot of money on video games.

Top 5 DLC Songs
1. "Moonage Daydream" by David Bowie
2. "Action" by Sweet
3. "Working Man" by Rush
4. "The Number of the Beast" by Iron Maiden
5. "Sprode" by Freezepop

Honorable Mentions: "Joker and the Thief" by Wolfmother, "Buddy Holly" by Weezer, "El Scorcho" by Weezer, "My Iron Lung" by Radiohead, "Limelight" by Rush, "Synchronicity II" by the Police, "More Than A Feeling" by Boston

Favorite Song By Instrument
Guitar: "Moonage Daydream" by David Bowie and "Joker and the Thief" by Wolfmother
Bass: "N.I.B." by Black Sabbath
Drums: "Action" by Sweet
Vocals: "Ever Fallen In Love?" by the Buzzcocks and "Moonage Daydream" by David Bowie

UPDATED 3/26: Added Boston Pack
UPDATED 7/1: Added everything I bought recently