Leslie Odom Jr. ( , born August 6, 1981) is an American actor and singer.
 He has performed on Broadway and in television and film, as well as in other theatrical productions.
 He is known for his work in the role of Aaron Burr in the musical "Hamilton", a performance for which he won the 2016 Tony Award for Best Actor in a Musical and the Grammy Award for Best Musical Theater Album as a principal vocalist, and Sam Strickland in the 2013 musical television series "Smash".
The Grammy Award for Best Musical Theater Album has been awarded since 1959.
 The award was given only to the album producer, and to the composer and lyricist who wrote at least 51% of the music which had not been recorded previously.
Bailey Ryon (born May 20, 2002) is a child actress from Southern Pennsylvania.
 She is known for originating the role of Matilda in Matilda the Musical on Broadway with fellow actresses Milly Shapiro, Oona Laurence, and Sophia Gennusa.
 She performed in Matilda from March 2013 to January 11, 2014.
 Her role in Matilda won her a Tony Honors for Excellence in the Theatre which she won jointly with her fellow Matildas.
 The Original Broadway Cast recording of Matilda the Musical was nominated for a Grammy Award for Best Musical Theater Album where she was listed as a principle soloist along with Bertie Carvel, Sophia Gennusa, Oona Laurence, Milly Shapiro and Lauren Ward.
Stephen Pate Bray (born December 23, 1956 in Detroit, Michigan) is an American songwriter, drummer, and record producer.
 He is best known for his collaborations with Madonna and for winning the 2017 Grammy Award for the Best Musical Theater Album of the Tony Award-winning revival of "The Color Purple".
 Bray owns and operates Saturn Sound recording studios and the Soultone Records record label.
Jerrold Lewis "Jerry" Bock (November 23, 1928November 3, 2010) was an American musical theater composer.
 He received the Tony Award for Best Musical and the Pulitzer Prize for Drama with Sheldon Harnick for their 1959 musical "Fiorello!
" and the Tony Award for Best Composer and Lyricist for the 1964 musical "Fiddler on the Roof" with Sheldon Harnick.
The Gene Kelly Awards for Excellence in High School Musical Theater, named after the actor/director Gene Kelly, are given out yearly by the Pittsburgh Civic Light Opera and the University of Pittsburgh.
 The award was founded in 1991 and celebrates excellence in the musicals of the Pittsburgh area's high schools.
 For Best Musical, there are three levels based on budget.
 The organization also offers scholarships to high school seniors involved in any aspect of the show.
 As of 2011, there are 29 participating schools.
 In 2009, the Gene Kelly Awards spawned the National High School Musical Theater Awards, nicknamed "The Jimmys", which the Pittsburgh Civic Light Opera co-produces with Nederlander Presentations.
Hairspray: Original Broadway Cast Recording is the cast album for the 2002 musical "Hairspray".
 The show is an adaptation of the 1988 film of the same name.
 It features performances from the show's cast, which includes Harvey Fierstein, Linda Hart, Dick Latessa, Kerry Butler, Clarke Thorell, Mary Bond Davis, Laura Bell Bundy, Matthew Morrison, Corey Reynolds, and Marissa Jaret Winokur as the lead character of Tracy Turnblad.
 The cast recording earned the 2003 Grammy Award for Best Musical Theater Album.
Krishna Das (born Jeffrey Kagel; May 31, 1947) is an American vocalist known for his performances of Hindu devotional music known as "kirtan" (chanting the names of God).
 He has released fourteen albums since 1996.
 He performed at the 2013 Grammy Awards, where his album, "Live Ananda" (2012), was nominated for the 2013 Grammy Award for Best New Age Album.
Once is a musical based on the 2007 film of the same name by John Carney.
 Like the film, music and lyrics were by Glen Hansard and Markéta Irglová, including the Academy Award-winning "Falling Slowly".
 The book for the musical was written by Enda Walsh.
 The musical premiered at the New York Theatre Workshop in 2011, before transferring to Broadway in 2012.
 The production received eleven 2012 Tony Award nominations, and won eight including Best Musical, Best Actor and Best Book.
 The musical also won the 2012 Drama Desk Award for Outstanding Musical and the 2013 Grammy Award for Best Musical Theater Album.
 It has since spawned a London production, with a North American Tour which started on 1 October 2013.
Jason Howland is a musical theatre composer, playwright, conductor, music director, and producer.
 In 2015, he won the Grammy Award for Best Musical Theater Album for his work producing the cast recording of "".
 He also wrote the music for the Broadway musical "Little Women".

Question: Who was the lyricist who wrote over 51% of the music for the Musical "Once"  that won the 2013 Grammy Award for Best Musical Theater Album?
Answer: Glen Hansard and Markéta Irglová