As well as playing on violin and Hardanger fiddle, Caoimhín Ó Raghallaigh plays an instrument made by Norwegian luthier Salve Hakedal, a fiddle with five bowed strings and five sympathetic strings, a cross between a Hardanger fiddle and a five string violin or viola d'amore which he calls a Hardanger d'Amore. (first made for American Hardanger fiddle player Dan Trueman, and commissioned by Caoimhín with the head and tailpiece of Salve Hakedal's Viola d’Amore model). Ó Raghallaigh uses crosstunings or scordatura (common in Norwegian and old-time American fiddling), and uses baroque and transitional bows made by Michel Jamonneau. Ó Raghallaigh also used to play a Viola Pellegrina Pomposa by American luthier David Rivinus, a highly asymmetrical five-string viola. Caoimhín also plays tin whistle, flute and uilleann pipes, having been taught whistle and flute by Co. Clare flautist Michael Tubridy of The Chieftains and Ceoltóirí Chualann.