Albums/eras with more than 1 billion cumulative views
My World + My World 2.0 - Justin Bieber
1. One Time - 300,087,916
2. One Less Lonely Girl - 170,454,314
3. Baby - 776,805,900
4. Somebody to Love - 226,929,391
5. U Smile - 67,409,274
TOTAL: ~1.54 BILLION VIEWS
AVERAGE: ~308 million views per video
The Fame + The Fame Monster - Lady Gaga
1. Just Dance - 153,285,722
2. Poker Face - 136,436,312
3. Eh, Eh - 55,367,222
4. LoveGame - 89,047,813
5. Paparazzi - 87,898,345
6. Bad Romance - 484,971,399
7. Telephone - 148,653,415 + 37,895,576 = 186,548,991
8. Alejandro - 176,451,773
TOTAL: ~1.37 BILLION VIEWS
AVERAGE: ~171 million views per video
Teenage Dream + The Complete Confection - Katy Perry
1. California Gurls - 52,445,613 + 60798408 (Pre-Vevo) = 113,244,021
2. Teenage Dream - 111,388,433
3. Firework - 318,282,097
4. E.T. - 194,147,360
5. Last Friday Night - 189,210,055
6. The One That Got Away - 131,526,678
7. Part of Me - 96,845,280
8. Wide Awake - 59,153,730
TOTAL: ~1.21 BILLION VIEWS
AVERAGE: ~151 million views per video
Recovery - Eminem
1. Not Afraid - 359,439,464
2. Love the Way You Lie - 492,602,975
3. No Love - 103,164,095
4. Space Bound - 65,893,455
TOTAL: ~1.02 BILLION VIEWS
AVERAGE: ~255 million views per video
I may have missed some. Care to post them?
Hopefully PSY will do it with one video. 
