Positive or epic songs

Adagio owns

Crazy talent in that band (Franck Hermanny is my favorite bassist ever, and Stephan Forte is my favorite 7 string guitarist (does rhythm and lead live).
I have plenty more from the early 00's and such, if you like this (power and prog are my favorite)!

POSITIVE (Force) :3
https://www.youtube.com/watch?v=9qW2CFfXIZM

EPIC(s)
https://www.youtube.com/watch?v=sGcvtyH8eCI
https://www.youtube.com/watch?v=tGoH-tIzW5Q

Can You Feel It by The Jacksons:

https://youtu.be/9nP4WE_-uqE

Positive, epic, and on Epic Records. ;-)

Positive:

Carry On - CROSBY, STILLS, NASH & YOUNG

=)

A track I find both positive and epic, from the sountrack of VVVVVV

You mean by positive is making you happy right? :)
https://www.youtube.com/watch?v=vQhqikWnQCU

Tenacious D - Tribute
https://www.youtube.com/watch?v=_lK4cX5xGiQ

Positive:
I don't know what would qualify as that (from your examples I would guess pop music). :c

Epic:
Rhapsody (of Fire) - Emerald Sword

Talamasca - The Time Machine

Thomas Bergersen - Ocean Princess (feat. Merethe Soltvedt)

EVERY TIME YOU LOOK AROUND by Miracle Of Sound

EPIC!

Maybe they're not what you are looking for, but back in the day those songs gave me goosebumps all the time, an instant smile and boosted my mood immediately. Needless to say the effect has worn off and I haven't found something with a similar effect, but I like the nostalgia of it nonetheless.

Bag Raiders - Turbo Love
Grum - Woah (Bestrack Remix)
Passion Pit - The Reeling (Bubblegum Scifi Remix)
One Republic - All The Right Moves (Danger Remix)

24 minutes of epicness:

https://www.youtube.com/watch?v=DIMBw5iCHpk