Some of the lyrics are:

I can't use it anymore
It's gettin' dark, too dark to see
... knock on devil's door
Knock, knock, knockin' on devil's door

It sounds like it could be by the Eagles or Three Dog Night. Any ideas on what song this is?

Root, you have a couple of wrong words in this lyric. The song you are looking for is a much-recorded classic written by Bob Dylan, called "Knockin' on Heaven's Door".

Check this page.

Thanks, Ozzz. After listening to several samples at Amazon, I see what I heard was Dylan himself singing (on Greatest Hits, volume 3). It's amazing how good he sounds with a band behind him. I remember him from his early albums as having a nasal twang.