looking for a song to sing

Thing One: If you were a senior in high school and you had to sing a song dedicated your peers and teachers, what song would you pick? Rules that we invented:

1. No songs from musicals or rock operas or anything with a storyline. Songs out of context = the devil!
2. Something that can be accompanied by a live piano or guitar -- no tacky karaoke tracks (not appropriate for the venue).
3. Nothing that conveys overt hostility towards yours peers/teachers. "Good Riddance (Time of Your Life)" by Green Day is OK, "Fuck You" by Lily Allen is not.
4. It's a relatively mellow event, so nothing too lively. "Dancing Queen" or "Tik Tok" are probably out of the question.

This survey is to benefit my younger sister, who has been hard-pressed to pick a song for Senior Solo Night, which is in a week. She had a relatively great high school experience, and so I think she really wants to pick a song that shows her appreciation for and warmth towards her friends and mentors. I gave her some good suggestions, most of which she nixed (I can't imagine WHY she wouldn't want to sing "I Shot The Sheriff") some of which she initially liked but then she couldn't find good enough sheet music. So I turn to you. Help me, internets. You're my only hope!

Thing Two: Unlike a lot of people, I basically loved high school. I found my niche early on (band geeks FTW) and stuck to it, and the social structure of my massive public school was too chaotic for a stifling clique-y heirarchy. Everyone basically left each other alone. I had my four best friends who accepted me for who I was (and still do!). I had teachers whom I respected and looked up to (and some I didn't of course). And there were a surprising amount of good looking guys when I was there, so had tons of eye candy to feast upon every. Single. Day. (Something you should know about me is that I was completely boy crazy for all four years of high school. If I wasn't lusting after a classmate, it was some celebrity or a guy I saw at a random Starbucks on my way to a flute lesson.)

Obviously I do look back and roll my eyes at a lot of things, cringe at my attitudes and actions, and sigh with relief that I don't have to wake up every morning at 6 and go be somewhere for seven hours, five days a week. I'm not trying to romanticize it. I think.

I guess what I'm trying to say is that while I'm glad high school is over, it wasn't exactly torture for me. And this whole thing with my sister's Senior Solo Night got me thinking about what I would have chosen to dedicate to my friends and mentors. I can't say for sure, but I like to think it would have been this:

I'm awake, you're still sleeping
The sun will rise like yesterday
Everything that we are now
Is everything we can't let go
Or its gone forever, far away
I hope tomorrow is like today
Don't you go away tomorrow
I don't think I could handle that
You're probably dreaming that you're flying on
Then you start to fall
But then you rise
and shine forever
Don't go away
I hope tomorrow is like today

Tell me what your experience was like! What song would you have chosen as your big fat farewell to high school? And you don't have to follow the rules I set above -- you can be as passive-aggressive (or just plain aggressive) as you please!