Things everyone should listen to at least once

Rhapsody in Blue -- George Gershwin
Take Five -- Dave Brubeck Quartet
Autumn Leaves -- Chet Baker, Paul Desmond
The Boy From Ipanema -- Peggy Lee

Piano Sonata No.10 in C Major, K.330 (300h) - III. Alllegro -- W.A. Mozart, Pianist: Glenn Gould
Song Without Words Op. 19 1 -- F. Mendelssohn
Adagietto, Sym. No. 5 -- G. Mahler
The Planets: Neptune -- G. Holst
Finlandia -- J. Sibelius

List of Guitar songs
Romanza -
Autumn Leaves -
Stairway to Heaven - Led Zeppelin
Vincent (Starry, Starry, Night)/American Pie/Castle in the Air - Don McLean
Blackbird/Yesterday/Let it Be/While My Guitar Gently Weeps/ANY of the slower Beatles stuff.
Your Body is A Wonderland -
If - Bread
Hotel California - The Eagles
Stories - Viktor Lazlo
Time In A Bottle - Jim Croce
Tears in Heaven - Eric Clapton
Smoke on the Water - Purple Haze
Leaving on a Jet Plane - John Denver
Don't Stop Believing - Journey
Don't Fear the Reaper - Blue Oyster Cult
Wish You Were Here - Pink Floyd
Hallelujah - Leonard Cohen
Dust in The Wind - Kansas
Windflower - Seals and Crofts
Dream On Aerosmith
Imagine - John Lennon