The word glide is used twice to describe the same thing, maybe you should use another adjective.

In the 5th line I think you menat strings not stings.

In the 3rd stanza 4th line, "sound" just doesn't seem right. maybe a word like come would fit better.

Overall it is a pretty good poem.

*Seeing Starz*

GREAT poem, very nice

I like the simile of a knife through butter and a bow across strings, but I think it would have been more effective if you had worked it throughout your poem, instead of in just one stanza.