Tubular Bells, also known as the Theme from The Exorcist.

I once heard a co-worker make lyrics for The Imperial March from Star Wars.

But, like others have said, I like instrumental without lyrics.

Intrigued? Hmmm maybe the finale to the William Tell Overture. Or Mozart's Rondo alla Turca!

Hall of the mountain king

Someone should put words to Nirvana songs. I always thought it would be cool if some of those songs conveyed some sort of message.

Second track from the famous Love Supreme, aka Resolution, has a version sang by Kurt Elling. Its lyrics is very much interesting.

Not exactly the theme, but I would love to hear Sigur Ros songs sung in English.

Flight of the bumblebee.

None. I like my instrumental songs without lyrics.

I don't know.

However, on the flip side, I like the lyrics to the MASH theme of: Suicide is Painless.

On Impulse by Animals as Leaders. It's significantly less intense than a lot of their other work, and while there's still plenty going on throughout it there is definitely some actual space for a vocalist to work on, rather than just adding another layer atop of an already full soundscape. There is also a video of one of the guitarists playing their song Behaving Badly with a guest appearance from a vocalist, and it's awesome. I like that she sticks to simpler melodies with notes held for a long time, so that she's not trying to compete with the business underneath and instead kind of floats gently just above it

I was pleased to hear that Manhattan Transfer added lyrics to Weather Report's Birdland. But I still prefer the original.

The answer for me changes based on what comes to mind at the moment. In this case, it's a cover of a Boid song.

Igorrr - Very Noise. But it's still best as an instrumental.

Green Onions.

FYI - someone put lyrics to the Peter Gunn theme years ago.

Original:

https://youtu.be/oysMt8iL9UE

Spyhunter:

https://youtu.be/qqw6yRlWc2c

w/ Lyrics:

https://youtu.be/sDIV8hriUfo