Washed Out

The one sound I think of when I think about dreaming is the harp glissando, which is this really atmospheric run up and down the scale that's really dreamy.

American Musician

Glissando is a musical term that indicates a fluid and continuous slide between notes.

Music Technique

Most common on keyboard and string instruments; it creates a unique sound that's easily recognizable.

Instrument Specific

While sliding, the tones usually follow a specific scale, creating a fluid musical passage.