The principle vocals were performed around American Italian jazz singer Rossana Casale and American chorus singer Naimy Hackett. The electro catchy techy disco sounds and melodies were all produced, written, arranged, and mixed by Mario Boncaldo and Tony Carrasco, and co-arranged with Davide Piatto.
During the mid-80s, singles like "Dirty Talk", "Wonderful" and "The MBO Theme" became major hits in both the emerging New York garage scene and Chicago's house community. Klein & MBO's first single "Dirty Talk" was originally released 1982 in Milan, Italy and soon after in the USA, where it became a huge hit and was subsequently released throughout the entire world. Tony Carrasco produced and mixed the last recorded Klein & MBO release in 1986, entitled "Keep in Touch", while his former partner Mario Boncaldo decided to go solo and formed the italo dance group MBO.