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Does anyone pay attention to those cassettes people shove into your hands at clubs? De La Soul’s Posdnous described the experience as “getting raped and giving birth to a tape.” Attention fledgling hiphop artists: There are friendlier and more productive ways to introduce your music to the world. Throwing a nice party, for example. After more than a year of progress and changes that included West Coast tours, national press coverage, and the loss of a member, the mid-Atlantic’s Unspoken Heard rap collective releases the Jamboree EP, a fun-filled follow-up to last year’s more cerebral Cosmology EP. Now a single parent, the Heard’s lone MC, Asheru, invites several well-known godparents to help cut the umbilical mike cord. Black Star’s Talib Kweli, J-Live, and local poet-MC W. Ellington are among those who will be helping to welcome the newborn. Mr. Complex, Shabaam Sahdeeq, and the Lone Catalysts also appear at 10 p.m. at Metro Cafe, 1522 14th St. NW. $10. (202) 518-7900. (Neil Drumming)