My definition of "too long" is basically Tales From Topographical Oceans, which is apparently the album that determines precisely how much of a Yes fan a person is; I listened to it once and concluded I wasn't that much of a fan.
Welcome to the Machine is a real old favorite; Pink Floyd was my first favorite band when I started listening to rock music (before that became Rush a couple years later, as it's generally stayed since with occasional competition from Queen). It is a long song, but it's dwarfed by two other tracks from its same album! (Both of them have the same title, because Pink Floyd.) Also by
Pink Floyd: Echoes
which is pretty goddamn special.
Point of obscura: Alan Parsons started his musical career as an engineer at Abbey Road studios, where he worked on the album of the same name as well as Dark Side of the Moon, which I'd say is a pretty goddamn great way to get a start in the music industry. (I actually don't like Dark Side of the Moon that much, though.)
And I never know what to make of The Voice. It's just so goofy.