Playbill.com has put together some of our favorite performances from Superstar, including rarities by Constantine Maroulis, Sinead O'Connor, Adam Lambert, Colm Wilkinson and even a look at the original production.

"I Don't Know How To Love Him" from the 1973 film.

Original Broadway cast on the Tony Awards.

Constantine Maroulis sings "Heaven on Their Minds."

Michael Crawford sings "Gethsemane."

"I Don't Know How To Love Him" by Renee Castle.

Colm Wilkinson sings "Gethsemane."

"American Idol" contestent Adam Lambert sings "Heaven On Their Minds."

Consantine Maroulis sings "Gethsemane."

Sinead O'Connor sings "I Don't Know How to Love Him."

The 2012 Broadway revival of Superstar.

Sarah Brightman sings "I Don't Know How to Love Him."

Lea Salonga sings "I Don't Know How to Love Him."

Helen Reddy sings "I Don't Know How to Love Him."

Melanie C. sings "I Don't Know How to Love Him."

Susan Boyle sings "I Don't Know How to Love Him."

Petula Clark sings "I Don't Know How to Love Him."

Linda Eder sings "I Don't Know How to Love Him."

Lea Michele sings "I Don't Know How to Love Him."

Elaine Paige sings "I Don't Know How to Love Him."

Kate Ceberano sings "I Don't Know How to Love Him."