Manny began singing in 1936, played bass with other bands, then formed his own band in 1948. He was the house band at the Marine Room on the Pleasure Pier out over the Gulf of Mexico; broadcasting nightly, until 1961 when the entire pier was destroyed by Hurricane Carla. He was also a regular at the famed Hollywood Dinner Club in Galveston, as well as the Shamrock and Rice Hotels in Houston.

The Manny Green Orchestra was the first to play a telethon in the state of Texas. This "first" featured Mel Torme, Chill Wills, Bob Crosby, June Christy and others. Manny accompanied many other stars who entertained in Galveston, such as Jack Imel, of the Lawrence Welk Show, and comedian, Jack Carter. When the Republican Convention was held in Houston, in 1992, Manny’s Orchestra was featured as part of the entertainment. In 1996 the band accompanied Myron Floren, also of the Lawrence Welk Show, in the 1894 Grand Opera House on the Historic Strand District in Galveston. Also in 1996 he played on the Carnival Cruise ship "Celebration" for a cruise to the Caribbean. In addition to playing for dancers in the Gulf Coast area, Manny often travels to San Antonio and the Rio Grande Valley. In September, 1997 Manny held a Big Band Gala, a weekend of dancing in Galveston, the first to be held in Texas. The Gala was attended by dancers from nine states. The event was such a success that it will be repeated this year, on September 25th, 26th, and 27^th.