Question: Mike Marshall is a bluegrass mandolinist who has collaborated with Darol Anger and a musician that started what record label?
Context: Elevation is the progressive bluegrass debut album of the Yonder Mountain String Band.  It was released in 1999 by Frog Pad Records, an independent record label run by the band.  The album features appearances by bluegrass musicians Mike Marshall and Darol Anger. Psychograss was an American bluegrass supergroup founded by fiddler Darol Anger and mandolinist Mike Marshall. The Lonesome Sisters, Sarah Hawker and Debra Clifford, were voted Best Acoustic Duo of 2006 by Gibson Guitars.  They have performed at venues such as the Newport Folk Festival and the Kaufman Center, Merkin Hall in NYC, and performed with Ginny Hawker & Tracy Schwarz, Jesse Winchester, The Levon Helm Band, Hazel Dickens, Alice Gerrard, Laurie Lewis, Dudley Connell, Marshall Wilborn, Tony Trischka, Mike Marshall and Darol Anger.  At Merlefest 2004 they performed and won best country song in the Merlefest Chris Austin Songwriting Contest for Sarah's song, "Forgiveness."  They have recorded six CD's on their own record label, Tin Halo Music.  "Follow Me Down" was voted best original song in the Clifftop WV Appalachian Stringband Festival Songwriting Contest.  Sarah was a judge in the 2007 Chris Austin Songwriting Contest. 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. Mike Marshall (born Michael James Marshall, July 17, 1957 in New Castle, Pennsylvania) is a bluegrass mandolinist who has collaborated with David Grisman and Darol Anger. Barbara Higbie (born 1958) is a Grammy nominated, Bammy award winning pianist, composer, violinist, singer-songwriter and multi-instrumentalist.  She has played on over 65 CDs including 3 tunes on the recent Carlos Santana CD.  A longtime Windham Hill recording artist, she has also recorded for Olivia/Second Wave records and Slowbaby Records.  She resides in the San Francisco Bay Area with her family.  She is a folk, jazz, pop, and fusion singer-songwriter, noted for her highly melodic, jazz/folk piano performances.  She has toured nationally and internationally since the early 1980s.  An early recording artist on the Windham Hill record label, she formed and played with the group Montreux along with Darol Anger, Mike Marshall, Todd Phillips, and Michael Manring.  She recorded a critically acclaimed album titled "Unexpected" with singer Teresa Trull in 1983, which was included in The Boston Globe's Guide to Best Albums of 1983.  Higbie and Trull teamed up again in 1997 to record an album titled "Playtime".  Since 1990, Barbara Higbie has released a number of solo albums on the Windham Hill and Slowbaby labels.  She is known as a versatile and soulful musician. New Acoustic Music is a music genre that blends influences from folk, bluegrass, jazz and world music and uses only acoustic instruments.  Beginning in the 1970s it has been developed by artists such as Bela Fleck, Leo Kottke, Tim Ware, Tony Rice, Mike Marshall, Darol Anger and others. Aoife O’Donovan ( ; ] ;) born November 18, 1982 in Newton, Massachusetts, is an Irish-American singer and songwriter.  She is best known as the lead singer for the progressive bluegrass/string band Crooked Still and as a member of the female folk-noir trio Sometymes Why.  Her first professional engagement was singing lead for the folk group The Wayfaring Strangers.  She has performed and recorded with Ollabelle, Karan Casey and Seamus Egan, Jerry Douglas, Jim Lauderdale, Darol Anger, Sarah Jarosz, Sara Watkins, Christina Courtin, Chris Thile (Nickel Creek, Punch Brothers), Noam Pikelny (Punch Brothers), Edgar Meyer, Stuart Duncan and Yo-Yo Ma.  O’Donovan has also performed with the Boston Pops Orchestra and the Utah Symphony Orchestra.  In 2012, she sang on most of the tracks on the album "Be Still" by the jazz group the Dave Douglas Quintet, featuring trumpeter Dave Douglas.  During the summer of 2013, she toured with Garrison Keillor and his "A Prairie Home Companion Radio Romance Tour." David Grisman (born March 23, 1945, in Hackensack, New Jersey) is an American bluegrass/newgrass mandolinist and composer of acoustic music.  In the early 1990s, he started the Acoustic Disc record label to help spread acoustic and instrumental music. The David Grisman Quintet is a self-styled alternative bluegrass/acoustic jazz band founded by David Grisman in 1975 in San Francisco, California, USA.  Inspired by such diverse genres as Bill Monroe's bluegrass legacy and Django Reinhard's 1930s swing, the Quintet created an entirely new style of acoustic music, and has inspired countless other musicians to take similarly eclectic approaches to their music.  Since its formation, the Quintet's members have included guitar virtuoso Tony Rice and multiinstrumentalists Mark O'Connor, Mike Marshall, Darol Anger and Jon Sholle.  The Quintet has performed and recorded with special guests such as violin great Stephane Grapelli, and remains active.  The National Public Radio program "Car Talk" uses the band's instrumental "Dawggy Mountain Breakdown" as its theme music.
Answer: Acoustic Disc