Each line lands where it is sung
The timing is the useful part. Knowing the words is easy; knowing exactly where the phrase starts against the beat is what makes a vocal sit right.
Vocals
Lyrics timed to the music
Lyrics on their own are a block of text. SheetMuse times them to the recording so each line arrives when it is sung, which is what you need if you are learning to sing a song rather than read it.
Sing over the band
Pull the lead vocal out with the stem controls and the song becomes a backing track with the words still in front of you.
See the structure
Verse, chorus and bridge are marked on the timeline, so you can jump straight to the section you are working on instead of scrubbing for it.