could someone recommend some good acoustic music

Pierre Bensusan 'Solilai' (CBS) is a classic.

Suzi Katz (ESD 80642) the tunes are not as consistent, but I like to use it as a reference because its a great recording and her voice can strike you as fair, good, or simply amazing depending on the system used. Features Steve Tibbetts and Marc Anderson of ECM fame. Track #8 'The People' is amazing.

"Blue Country Heart" by Jorma Kaukonen on SONY SACD. If the system has a trace of hardness or edge this disk will reveal it. I like the musicianship and songs also. Don't know if there is a CD version but this should be easy to find out.

Norah Jones - daughter gave to me for xmas - nice sonics stand up bass and great voice...

A Shout Toward Noon/Leo Kottke. Maybe hard to find but your search will be worth it.

I agree with Pops-Norah Jones. What a talent. Not sure about the CD but very good on vinyl.

If you want an easy-to-find, newer release, try Alison Krause and Union Station's new double live CD. Don't be scared off by the fact that it's a live performance--it is a superb recording. If you haven't heard Alison Krause, it would be a good introduction to one of the best female vocalists anywhere. She also has a great band, especially Jerry Douglas on dobro.

Of course, you can't go wrong with Joni Mitchell's "Blue."