Also I looked at all (rather than just solo) songs to sell 295k (300 if rounded to the nearest 10) in a non-post-Xmas week, with non-solos marked:
[Right Round 636
We Are Never Ever Getting Back Together 623
[Somebody That I Used 542
Boyfriend 521
Born this Way 509
[Payphone 493
[Boom Boom Pow 465
[Crack a Bottle 418
Forget You 412
Hold It Against Me/Part of Me 411
[We Are Young 390
Not Afraid 379
I Will Always Love You 367
[California Girls 359
Rolling in the Deep 353
[Love the Way You Lie 352
[ET 344
[Live Your Life 334
Today was a Fairytale 325
Call Me Maybe, Gangnam Style 301
Begin Again 299
Mine 297
24 songs. Top artists:
Taylor: 4 solos (+ apparently 1 solo this week, with possibly more to come this month), so in the lead even counting features for other artists who need those for sales
Katy: 1 solo + 2 leads
Eminem: 1 solo + 2 leads
Rihanna: 2 featured
Adele: 1 solo (+ possibly 1 solo this or next week) to become the 2nd with 2 solos