Finnegan, began playing whistle at age 8 and flute at age 10 as a student of the Armagh Pipers Club  under the tuition of the Vallely family. He first came to public attention with the Irish group Upstairs in a Tent, and then in 1993 he made a solo album When the Party's Over, which was recorded at Redesdale Studios. In 1995 he formed Flook. Originally a three piece who toured as 'Three Nations Flutes' with Sarah Allen and Mike McGoldrick, they later added Ed Boyd on guitar forming Flook. When Mike left the band in 1997, John Joe Kelly (a frequent guest musician) was added as a band member on bodhrán. Flook continue to tour all over the world with fans across the globe. In 2006 Flook were awarded best band in the BBC Radio 2 Folk Awards. He is a frequent tutor for Folkworks and Burwell Bash where he has been a tutor since 1994. He tours regularly across the USA, Latin America and Ireland with guitarist William Coulter with whom he released the EP 'Toward the Sun' in 2015. He also plays with an influential Russian rock group Aquarium, both live and on their studio albums (since approximately 2009). He worked on cross genre project Parallelogram  who toured across the UK in 2007 blending Jazz and Folk. Parallelogram featured fiddler Aidan O’Rourke, accordionist Martin Green, guitarist Kris Drever, saxophonist Pete Wareham, bassist Oli Hayhurst and drummer John Blease.
As of 2010[update], Brian plays with his own trio, with guitarist Ian Stephenson and drummer Jim Goodwin. They formed a four-piece, KAN, with those musicians and fiddler Aidan O'Rourke until disbanding in 2014.
A solo album, The Ravishing Genius of Bones, was released in 2010.
- Armagh Pipers Club Website
- Brian Finnegan Band, Armagh Pipers Club website Archived December 2, 2009, at the Wayback Machine..
- Brian Finnegan, Paul McSherry website.
- Burwell Bash website
- Luck o' the Irish, Pasadena Weekly, 24 September 2009. Retrieved 2012-09-24.
- Brian Finnegan y Landeral, en la tercera jornada del Intercéltico (Spanish), El Diario Montañés, 21 August 2010. Retrieved 2012-09-24.
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