"Dreamin'" is the third single (released as an iTunes single) from American alternative rock band Weezer's sixth album, Weezer (2008).

[1] In the booklet for Rivers Cuomo's demo compilation album Alone, Cuomo describes how the song "This Is the Way" was originally going to be used for the Red Album over "Dreamin'," then called "Daydreamer."

Eventually, Cuomo was able to persuade other band members to choose the "epic, 6-minute, symphonic type of art song" Dreamin' instead.

[2] Brian Bell has commented that this song was "actually based on the sonata form" and the breakdown of the song has a formal name ("The Dream Sequence") in response to a question asking what was each band member's proudest moment on the album.

The song mentions the Widener Library Stacks at Harvard University where the composer Rivers Cuomo attended and graduated from.