I am a big Nujabes fan
Lady Brown
http://youtube.com/watch?v=QxHQKUNxzsA&feature=related
World's End Rhapsody
http://youtube.com/watch?v=VGJP_eI3j_g&feature=related
Counting Stars
http://youtube.com/watch?v=2O0kuoiAm2A&feature=related
Substantial "Ain't no happy ending"
http://youtube.com/watch?v=ShgTAw9cyVk
Hikari
http://youtube.com/watch?v=fYIgbiPTVxQ&feature=related