Ipse Dixit has a cool little archive entitled "Five songs you can never grow tired of". Well, I looked over the selections, and while I like a lot of the songs there, none of my personal faves are listed. So, here is MY list, in no particular order:
Only YesterdayCarpenters
Shattered DreamsJohnny Hates Jazz
MissingEverything But the Girl
DreamwalkKeiko Matsui
New Day for YouBasia
All of these songs are vocals, except for "Dreamwalk", although I could easily add another five songs and end up with five vocals and five instrumentals. That is not the rule, however, so five will have to do.