...but here are some songs anyway.
a letter from home - ulrich schnauss
floaty swooping soaring electronic landscapes, perfect for lying on your bed in the dark with the windows open, or driving through the countryside in the sunshine.
buy a strangely isolated place
strawberry letter 23 - shuggie otis
another floaty song, but sparklier this time. wikipedia says 'Otis wrote the song for a girlfriend who used strawberry-scented paper when she wrote letters to him' which is pretty darn cute if you ask me.
buy some shuggie otis
you are invited - the dismemberment plan
not really a letter, but an invitation is close enough right? i haven't listened to this song much recently but it's always been a personal anthem of sorts, just a little a reminder that i am invited, by anyone, to do anything. and now you are too!
buy emergency & i
young shields - casiotone for the painfully alone
this was the first CFTPA song i ever heard, and it's still one of my favourites.