Steve Colson, pianist/composer and band leader, with vocalist Iqua Colson — a couple members of American experimental music‘s cutting edge AACM for some 35 years — give a rare performance quartet Saturday night (Feb 6) at NYC’s Thalia theater in Symphony Space. Everyone who attends gets the Colsons’ new CD, The Untarnished Dream, for free. One-time promotion? Start of a trend? Acceptance of reality?