Yvonne Elliman

Yvonne Marianne Elliman (born December 29, 1951) is an American singer who performed for four years in the first cast of Jesus Christ Superstar. She scored a number of hits in the 1970s and achieved a US #1 hit with "If I Can't Have You." After a long hiatus in the 80s and 90s, during which time she dedicated herself to her family, she made a comeback album as a singer-songwriter in 2004.

source: Wikipedia