- The De profundis was sung as part of a Haiti earthquake relief concert, Du fond de ma pensée, held at First Church in Boston (26 Feb 10).
- The choir of the Cathedral Church of St Paul (Episcopal) in Boston sang the Nunc dimittis from the Evening Service in D (14 March 10).
- The choir Sine Nomine, under the direction of Paul Cienniwa, sang The Passion According to St John in Fall River, Massachusetts. (19 & 21 March 10) [ video here ]
- The choir of First Church Boston sang Love Is the Spirit (2 May 10).
- Assisted by Peter H. Bloom & Paul Cienniwa, Karl played a recital at St Paul’s in Boston (12 May 10). Program: Lunar Glare, Swivels & Bops & Fragments of « Morning Has Broken ».
- Karl & Bill Goodwin played some Henningmusick as part of a service at the First Congregational Church in Woburn, Massachusetts (16 May 10).
- Assisted by Peter H. Bloom, Karl played a recital at King’s Chapel in Boston (18 May 10). Program included: Heedless Watermelon, All the Birds in Mondrian’s Cage, Swivels & Bops & Here You Go / Hear You Go.
- Karl & Paul Cienniwa played portions of Lunar Glare at First Church in Boston (30 May 10).
- Together with Nicole Randall Chamberlain, Brian Chamberlain, Eric Mazonson & Paul Cienniwa, Karl played a recital at the First Congregational Church in Woburn, Massachusetts (21 June 10). Program included: Lunar Glare, Gaze Transfixt, Mirage & Night of the Weeping Crocodiles.
- Together with Nicole Randall Chamberlain & Brian Chamberlain, Karl played a recital at the West End branch of the Boston Public Library (22 June 10). Program included: [stand by].
- Violist Dana Huyge will play the première of the Viola Sonata, Opus 102, in Rochester, NY (18 September 10).
- Karl will play a recital at King’s Chapel in Boston (26 October 10).