Question: What American progressive bluegrass group from Nederland, Colorado has a song is hidden after three minutes of silence on the track "Peace of Mind"?

Context articles: Yonder Mountain String Band
Northern Lights (bluegrass band)
Hop High
Shaken by a Low Sound
Cadillac Sky
Sara Watkins
Still Crooked
New Grass Revival discography
Some Strange Country
Town by Town

The Yonder Mountain String Band (abbreviated "YMSB" and referred to by some as just "Yonder") is an American progressive bluegrass group from Nederland, Colorado.
 Composed of Dave Johnston, Ben Kaufmann, Adam Aijala, Allie Kral, and Jacob Joliff, the band has released five studio albums and several live recordings to date.
Northern Lights was an American Progressive bluegrass band formed in 1975 in New England, which musical career spanned more than three decades.
 Known for a progressive style of bluegrass playing, the band went through a number of line-up changes through the years and included such personalities as Alison Brown or multiinstrumentalist Jake Armerding, son of founding member Taylor Armerding, who started playing with the band full-time at age of 14, but played occasionally when he was 12.
 As of 2009, there is no founding member left in the group.
 Guitarist Bill Henry, who joined the band in 1982 assumed the leadership role and Northern Lights continue to play without interruption as a quintet, consisting of two generation of musicians - Bill Henry, John Daniel and Alex MacLeod as well as young players Eric Robertson and Mike Barnett.
Hop High is the debut album of progressive bluegrass group Crooked Still.
 Most of the songs on this album are traditional, but played in a different way than by other artists - with lineup without traditional bluegrass instruments like guitar and mandolin, consisting of cello, bass and banjo only (occasionally adding guitar and fiddle).
Shaken by a Low Sound is the second album of progressive bluegrass group Crooked Still.
 With repertoire mostly consisting of traditional music the group sounded original with the combination of Aoife O'Donovan´s vocals and the unusual banjo-cello-double bass line up.
Cadillac Sky is a Progressive Bluegrass group based in Nashville, Tennessee.
 The band is currently on an "indefinite hiatus".
Sara Ullrika Watkins (born June 8, 1981) is an American singer-songwriter and fiddler. Watkins debuted in 1989 as fiddler and founding member of the progressive bluegrass group Nickel Creek along with her brother Sean and mandolinist Chris Thile.
 In addition to singing and fiddling, Watkins also plays the ukulele and the guitar, and also played percussion while touring with The Decemberists.
Still Crooked is the third album by progressive bluegrass group Crooked Still.
 At the end of 2007 Rushad Eggleston parted ways with the group and was replaced by Tristan Clarridge, cellist of Darol Anger's Republic of Strings.
 Brittany Haas, 5-string fiddler of the same group, was added to the Crooked Still lineup as well.
The discography of progressive bluegrass group New Grass Revival, spanned two decades (1972-1989), comprises nine studio albums, two live albums, and appearances on albums of other artists, including Leon Russell and Peter Rowan.
 Three compilation albums have been released since the group's break-up in 1989.
Some Strange Country is the fourth studio album by progressive bluegrass group Crooked Still.
Town by Town is the third studio album by the progressive bluegrass collective Yonder Mountain String Band.
 It was released in 2001 by Frog Pad Records.
 A song is hidden after three minutes of silence on the track "Peace of Mind".