Since I had a synthesizer/keyboard in childhood, I kind of learnt to hear individual tracks separately in an accompaniment or song.
Percussion 1,2 – Drums…Bass…rhythm 1,2 – guitars, Pad chord – strings, melody 1,2 – special effects or inserts.
8 tracks in the accompaniment
1 lead track, 1 track supplementing the lead etc.
In a typical song, I can easily break up 7-8 tracks and hear them individually. I think this is a great concentration exercise and it really helps you get deeper into the music.