If anyone has a
Nico Nico Douga account and is really good with identifying anime and miscellaneous Japanese internet culture tunes, please take a listen to
this. (Note: you can't watch the video unless you have an account. An account is free, but the whole site is in Japanese, and recently Nico Nico only allows new free users to watch during certain times.)
It's a collection of screenshots from The Melancholy of Haruhi Suzumiya, but that's not really the important bit, since it's set to an ten-minute dance medley of all sorts of (synth instrumental) songs. You can keep it in the background if you like and just listen to the music, which is what I'd like identification of.
01:19 - Hare Hare Yukai (ED theme from MoHS)
01:51 - I know I've heard this on one of the various Touhou flashes.
03:27 - Makka na Chikai (OP theme from Busou Renkin)
04:43 - Tori no Uta (OP theme from Air)
05:06 - Natsukage (BGM from Air)
05:29 - Also from another Touhou flash. I think this one is "Marisa Stole My Precious Thing".
06:25 - Omoide ga Okkusenman (aka Megaman 2, Wiley Stage 1)
07:18 - God Knows (Image song from MoHS)
07:43 - Motteke! Sailor Fuku (OP theme from Lucky Star)
08:41 - Futari no Mojipittan (Kotoba no Puzzle BGM)
09:03 - Super Mario World BGM (the one for regular stages)
09:11 - True My Heart (Nursery Rhyme OP theme, by ave;new featuring Sakura Saori)
09:25 - Kiss My Lips (probably another H-game OP theme, also by ave;new featuring Sakura Saori)
09:54 - Final Fantasy Theme
10:42 - Sakura Sakura (traditional Japanese folk tune)
Obviously there are huge gaps in between.
UPDATE: Solved. It's the Nico Nico Medley.