"Mamma Mia" and "Dancing Queen" are among the beloved hit tunes you'll hear when Dancing Dream performs its tribute to ABBA, at Westchester Broadway Theatre in Elmsford, on Saturday, Aug. 18. The New York City-based group, which has been featured on "The Late Show with Stephen Colbert," is known for its electrifying performances, celebrating the music of this famous Swedish pop act. Audience members can expect beautiful harmonies, exciting choreography and elaborate costumes, reminiscent of the glitz and glamour of the 1970s.