Sorting by path does not sort really by path, but plain string alphabetical order. This means if songs are in root directory, they can be everywhere in the list
E:\AlphaSongs.mp3
E:\Bsubdir\AAASongs.mp3
E:\Bsubdir\BBBSongs.mp3
E:\Bsubdir\CCCSubdir\AAASongs.mp3
E:\Bsudir\CCCSuperSong.mp3
E:\GammaSong.mp3
E:\Omegasubdir\...
E:\ZetaSong.mp3
Doesn't make sense