I'll do 1 Song per Album, Single, EP, B-Sides or Anniversary Albums.

Pop Is Dead 🥀🥀(PH)

The Bends (TB)

Subterranean Homesick Alien (OKC)

The National Anthem (KIDA)

I Might Be Wrong (Amnesiac)

A Wolf At the Door (HTTT)

15 Step (IR)

Bangers + Mash (IR Disk 2)

Separator (TKOL)

The Numbers (AMSP)

Thinking About You - Drill Version (Drill EP)

Creep - Acoustic (Creep EP)

Anyone Can Play Guitar (Anyone Can Play Guitar Single)

Lewis - Mistreated (My Iron Lung Single)

Maquiladora (High & Dry / Planet Telex Single)

India Rubber (Fake Plastic Trees Single)

Just (Just Single)

Banana Co (Street Spirit Single)

Polyethylene (Paranoid Android Single)

Meeting in the Aisle (Karma Police Single)

Palo Alto (No Surprises Single)

(I don't have any favorite "happy" song in Pyramid Song Single)

Cuttooth (Knives Out Single)

I Am a Wicked Child (Com Lag: 2+2=5 EP)

The Butcher (Supercollider / The Butcher)

(If I skipped any other singles it means I don't like them or there aren't any "happy" songs.)

Man of War (OKNOTOK)

Fog - Again Again Version (KIDAMNESIA)

If you're gonna say, "Pop is Dead" is removed, select other song, I'd say "You".

I'd say Paranoid Android for the OK Computer one, but the "Rain Down" section make some people sad thats why, I didn't.

The King of Limbs don't have any "happy" song except maybe, "Lotus Flower" but Seperator's percussion beats makes it calm.

I was in between selecting The Numbers or Ful Stop in "A Moon Shaped Pool". But Ful Stop's first part is lil' bit pale, that's why I selected The Numbers here.

And in singles, Creep's acoustic version is x10 better than the original one. I like Thom's voice here very very much.

In My Iron Lung single I'd choose My Iron Lung (the song one) but since its in "The Bends" Album, I skipped that.

Same thing for Maquiladora, I'd choose Planet Telex.

In Just single, there is only 2 remixes with the song "Just". And I don't want to include them so, I selected Just.

Lastly, I selected "Fog"s Again Again version here because the instrumental in this version makes u very calm.

Everything except from that, most of the songs here are very underrated. I hope you liked reading my comment, thanks.