Formed in 1976, OMAC Records was the brainchild of a young teenaged bluegrass prodigy, Mark O’Connor, and his mother Marty. Their indie label was designed to capture once-in-a-lifetime recording projects by the young O’Connor and renowned musical guests. Beginning in the mid 1970s, the iconic A Texas Jam Session featuring Four World Champion Fiddlers was the label's first release. Fast forward 25 years, the label released more great acoustic music; two Hot Swing Trio recordings featuring string jazz music's Frank Vignola and Jon Burr and their tribute to O'Connor's teacher Stephane Grappelli. Around the same time, OMAC released Grammy-nominated bluegrass projects; Thirty-Year Retrospective and Jam Session featuring the genre's hottest pickers, Chris Thile and Bryan Sutton.

Over the following 10 years, a succession of orchestral albums were released; O'Connor's The Double Violin Concerto featuring classical violin great Nadja Salerno-Sonnenberg, the breakthrough composition, The Improvised Violin Concerto CD and DVD filmed in Boston Symphony Hall, and the Americana Symphony featuring O’Connor’s masterpiece of American orchestral writing performed by legendary conductor Marin Alsop and the venerable Baltimore Symphony. During the same time period, a perennial classic holiday album was released; An Appalachian Christmas featuring Alison Krauss, Yo-Yo Ma, Renee Fleming, Steve Wariner, Jane Monheit, Sharon Isbin and others. 45 years after the label saw its first release, the Grammy-winning "Mark O’Connor Band” featuring the talented O’Connor family released A Musical Legacy featuring country superstar Zac Brown. It was followed by a critically claimed solo guitar album that O'Connor reprises from his teen years; Markology II.

In addition to more scheduled new releases, over the last few years, OMAC Records has acquired three albums from O'Connor's historic Rounder Records catalog from the 1970s, and, has begun to roll out his entire Warner Bros. Records catalog, all of them remastered and reissued. The acquisition will include many titles that helped earn O'Connor 3 Grammy's and 7 CMA awards for "Musician of Year."

With its humble beginnings in Mountlake Terrace, WA, OMAC Records found its name by the mixture of O’Connor’s name, and Marty’s maiden name MacDonald. Many years have gone by since Marty's passing, but she leaves us the legacy of OMAC Records, possibly the oldest family-run indie record label in existence and, representing one of most impressive catalogues by any American musician.