RIGHT I had a go at doing Madonna and WHAT A FUCKING RABBIT HOLE THAT WAS.
Still fun though
Madonna is probably the artist most affected by play counts split by song length not being recognised as the same song. She has so many different edits of her big hits strewn across compilations (as it so happens, the compilation function on Madonna's page doesn't seem to WORK, which is ODD in itself...)
370m - Material Girl
351m - Like A Prayer
323m - Hung Up
278m - La Isla Bonita
258m - Like A Virgin
251m - 4 Minutes
204m - Vogue
161m - Holiday
108m - Into The Groove
105m - Papa Don't Preach
98m - Crazy For You
97m - Frozen (actually 216m if you count the recent remix)
The consistency of accessing songs is all over the place. In some cases the studio version is the default, in others it's the compilation version. One example: on LAV, Material Girl has 45m plays; seems low. On Celebration, that version has 318m plays.
It gets more complicated from there because live versions of Vogue and Like A Prayer probably make up another 30m or so each, but I've only counted studio versions. There's just SO many versions of songs for people to access.
Finally Enough Love have even MORE versions but they've barely made a dent on the bigger tunes... yet.