Over the course of the year, the group enjoyed more success in the charts after their second single, "S Club Party", entered the UK charts at number-two and went straight to number-one in New Zealand. Their third single was a double A-side and featured the ballad, co-written by Cathy Dennis, "Two in a Million" and retro-styled, up-tempo "You're My Number One". The former was the first single where O'Meara took leads vocals, setting the standard for future S Club 7 releases; the single also reached number-two in the UK charts. Following the success of their television show and released singles, the group released their debut album "S Club" in October 1999. The album quickly rose to number-two in the UK charts, and then became certified Double Platinum. The album consisted of a variety of styles including motown and salsa tracks.