I guess it's still Dead End Friends with 91, then:
Bohemian Rhapsody: 72
25 or 6 to 4: 70
Crosstown Traffic: 67
Break On Through (To The Other Side): 65
It's My Life: 63 (and first DLC on the list)
Bad Medicine: 60
Mr. Crowley: 59
Riders on the Storm, Light My Fire, All Along the Watchtower, Keep Yourself Alive, Clampdown - each has been played well over 200 times.
There are tons of songs with over 100 plays (majority of Jimi Hendrix, Doors, Queen, Clash, Def Leppard library).
Panic Switch (25)
Seize The Day (23)
Adam's Song (19)
Beautiful Thieves (18)
are my top 5.
Pretty much every Queen song over all the others, along with Wasted Years by Iron Maiden.
After my save file got corrupted, my new high is Firefight by Blackguard with 9.
Looks like its Antibodies for me (44).
Not entirely sure. The only time I intentionally pick a specific song to play is when I buy it. Every other time, I either party shuffle or play random setlists in road challenges. It does seem, though, some songs come up much more often than others.