Beginning with his score for the Tim Blake Nelson-directed movie, O, in 2000, Danna has focused on film composition. His film credits include the soundtracks of The Kid Stays in the Picture, Green Dragon, The Boondock Saints, Lions Gate's Uncorked, and My Own Country. He reunited with Nelson when he composed the score of the Lions Gate World War II film The Grey Zone. Other scores include both animated and live-action features, with such divergent projects as All Saints Day, Fracture, Terry Gilliam's The Imaginarium of Dr. Parnassus, Resident Evil: Apocalypse, Miss Spider, Silent Hill, Richard Attenborough’s Closing the Ring, and Neil Labute’s Lakeview Terrace.
Danna has remained active as a musician, recording traditional and original Celtic music with his brother and keyboardist, Mychael
. The brothers, who have received three BMI/SOCAN awards for scoring excellence, collaborated on albums including A Celtic Tale: The Legend of Deirdre, A Celtic Romance: The Legend of Lladain and Curithur and a second version of A Celtic Tale: The Legend of Deirdre, featuring narration by Fiona Ritchie of National Public Radio show, Thistle and Shamrock.