I tend to write better, and even knit better, when there are no words to a song, not elevator music that had the words taken out for copyright purposes, but songs that don't actually have words.
My Favs are:
Prelude No. 15 (?? I think, Raindrops)
A Lark Ascending
James Bond Theme
Movie scores are generally good for this too.
So go ahead! Give me words about music with no words!!!