I find it hard to pick my favourite album....but i think the Madonna song i love the most right now is most definitely Words from Erotica!
It really is a fantastic kinda "defense" song, words may attack you but you end up stronger and fighting back....it is so poignant on so so many levels bullying, spousal abuse, racism....and fighting back against it

Very powerful.
Most absurd song - Impressive Instant from the Music album, the beats, the deep Trance style by Mirwais and the nonsensical flow of the lyrics are amazing.
Keep It Together from the Like A Prayer album, i do wish it had more attention....very much adapts a Psychadelic Funk beat from the late 60s Underground scene and has a message that is very autobiographical and you take a ride on the journey....it is a showcase anthemic song! Very Deep Funk and Madonnas vocals are HAWT!
Let It Will Be from Confessions On A Dance Floor, (notice a pattern here) it very much is autobiographical on some levels, the rapid paced beats and Trance....and Madonna adapting a Kraftwerk style vocal meets Punky belter....IMMENSE.
&, Skin from Ray Of Light....very multi-layered in beats and progressive, about a fight for survival and the sonics and electric guitar rhythms are very fast paced and energetic and Madonnas vocal is very euphoric and dramatic too.
That was tough norrowing them down....millions more....and her next album will only make it tougher too.