Mark Geslison and Geoff Groberg arrange and record hymns using handmade acoustic instruments. Some arrangements include a mixture of folk instruments like octave mandolin with classical instruments like french horn or oboe. The arrangements are meant to be reflective of America's christian past. Geslison and Groberg commonly refer to their music as "Early American Hymns." The instruments used on their recordings include numerous handmade guitars, mandolin, and banjos. Among these instruments is a 1921 Gibson A4 mandolin, a 1955 Bjarnton Swedish nylon-string guitar, a 1978 Martin HD28 guitar, a 1984 Flatiron A5 mandolin, a 5-string banjo made by Geoff Groberg, and a 1950s era arch top guitar that Geoff rebuilt in 2012. Instruments heard on Geslison Groberg recordings vary greatly. Though most tracks contain guitar, piano, or mandolin, many tracks contain instruments like fiddle, violin, flute, clarinet, bassoon, autoharp, banjo, bass, french horn, oboe, mountain dulcimer, octave mandolin, low "D" whistle, pennywhistle, bodhran, and voice.
Nate Olson: Fiddle (on Come, Thou Fount of Every Blessing)
Alina Geslison: Fiddle (on Lead, Kindly Light)
John Wright: Violin (on Come Follow Me/Jesus, the Very Thought of Thee, Be Thou My Vision)
Jaren Hinckley: Clarinet
Annie Rosevear: Flute
Natasha Wallin: Oboe
Jessica Judd: Bassoon