Dancers7. You can really feel your mind running at the speed of light along with with Keiichi's, when it plays during his planning of Teppei's murder in Tatarigoroshi.It is surprisingly cold and dark, with a hint of fury, as a murderer needs to be.
(it should go without saying to watch Kai before this)
Image song, and also qualifies. I would include Rena and Hanyuu's songs, but those are more cute than crowning.
Matsuribayashi's Being Shows Hanyuu's determination to fight fate and Takano in the final world, while Festival is the theme of the Watanagashi festival that arc.
From Matsuri, "Free" is a HUGE Tear Jerker when it's played. "Hitori" is cute, but is just depressing when played in the Matsuri-only Taraimawashi-hen when Mion becomes a Comatose Canary, and in the end of Tatarigoroshi-hen.
If there is ever a reason to be excited for the upcoming PS3 re-make, Majou to Suiri no Rondo, it would have to be its opening, Chikai Hibiki no Igreja.
Ougon Musou Kyoku X's opening theme, Ougon no Kiseki wo Kanaeru Made (Fulfill the Golden Miracle), and its full version from the Dear Golden Witch album is just as epic as the opening of the PC version.
Tsubasa was mindblowingly awesome. The vocal version is the ending theme for Episode 5, but when you change those vocals to electric guitar you get a different but equally awesome remix.
Umineko is also so good at this that it makes piano-driven pieces into epic CMOA. See Answer (just wait about 40 seconds if you don't hear it) and dir.
Answer got EXTENDED by about 40 seconds in the PS3 version.
Still from Episode 5 is JUSTICE, which notably plays when Battler revives and ascends to the rank of Endless Sorcerer in the the Hidden Tea Party.
Sakutaro's theme, Sakutarou no Ganbarimonogatari, which incorporates a marimba version of Door to Summer and happiness of marionette for a BGM so adorable that just listening to it will give you diabetes.
This troper's sister was listening to the song, and had a random person who had never even heard of Umineko come over and say, "That... is the happiest song I have ever heard."
dai's half of the OST, "musicbox Blue", has a load of tracks that weren't used in the games yet at the time of its release; several of them have shown up in the games since, so the others may yet be used. Please, please let Oku and Black knight be among those that get into Twilight of the golden witch.
Similarly, the previously unreleased track Mata Umarekawaru Hi Made (until the day we're reborn), a beautiful mix of Umaretekitekurete Arigatou and happiness of marionette.
A song which title makes me wonder if it isn't a thank you to all the readers of Umineko: Thanks of all people
From episode 6 we have the beautiful yet sad Loreley
ZTS
The doujin music composer ZTS also makes several tracks in Umineko, and they have the trademark of making at least one incredibly epic piece per episode.
From Episode 3, far. Starts slow and sweet, then ascends to a really heartwarming violin piece. Its Episode 7 piano remix, far(flat), is equally awesome.
From the very beginning of episode 1, you have the heart-rending stillness of Slow Motion which feels like looking out a sunlit window, and catching sight of a solitary butterfly. Tekuteku Captures the regal, somber air of the Ushiromiya household.
This troper loves the epic piano music in the Umineko series and feels the need to add the end of the world.
There's a vocal version as well that adds awesomeness to awesomeness.
