The guitar/pedal steel duet from Dire Straits Where Do You Think You're Going off the Money for Nothing (greatest hits) album is one of the most moving solos I've ever heard, but it needs to be a lot longer. The link has a version of the song, but it doesn't include the steel guitar. Still good, though.
After that, it's the solo from Comfortably Numb as recorded on the original Wall album.
After that, it's the solo from Comfortably Numb as recorded on the original Wall album.