Cass - need new calculator! Let's see:
24 X 30 = 720 hours/month
720 X 60 = 43,200 mins/month
43,200 / 3.5 mins (average as stated in footnote to PR) = 12,342.857 songs
Yup, they lied. In these simplistic terms, they shorted themselves by about 2,500 songs!
Hope this helps.
SGE