Celebrate International Jazz Day on Wednesday, April 30, with a great concert that will bring Eastman faculty members and students to perform music you’ve never heard before – and neither have they, since every note will be improvised, created on the spot. Spontaneous Duos is presented by the Eastman Community Music School and the Institute for Creative Music at 7:30 p.m. in Eastman’s Messinger One, on the first floor of 10 Gibbs Street.