Answer by taking a quote from the following article:

Maria Lea Carmen Imutan Salonga, KLD (born February 22, 1971), known as Lea Salonga (), is a Filipina singer and actress best known for her roles in musical theatre, for supplying the singing voices of two Disney Princesses, and as a recording artist and television performer. At age 18, she originated the lead role of Kim in the musical Miss Saigon, first in the West End and then on Broadway, winning the Olivier and Theatre World Awards, and becoming the first Asian woman to win a Tony Award. Salonga is the first Filipino artist to sign with an international record label (Atlantic Records in 1993). She is also the first Philippine-based artist to have received a major album release and distribution deal in the United States, and one of the best-selling Filipino artists of all time, having sold over 19 million copies of her albums worldwide.

On January 30, 2013, Salonga took part on the 2013 season of Lincoln Center's American Songbook concert series at the Allen Room. In the Philippines, Salonga provided the theme song for TV5's reality singing competition Kanta Pilipinas which premiered on February 8. On February 18, Salonga, Tyne Daly and Norm Lewis starred in a concert performance of Ragtime at Lincoln Center's Avery Fisher Hall. Salonga played Mother. Salonga headlined a concert series, "4 Stars One World of Broadway Musicals," in Tokyo from June 15-23, and in Osaka from June 27-30. She performed with, Ramin Karimloo, Sierra Boggess, and Yu Shirota.  She was one of the four coaches, together with apl.de.ap, Sarah Geronimo and Bamboo Manalac for the ABS-CBN program, The Voice of the Philippines, which premiered on June 15, 2013. In December 2013, Salonga began a concert tour in the Philippines titled "Lea Salonga: Playlist" that celebrated her 35 years in show business. The concert series was extended to January 2014. Salonga wrote a book, Playlist: A Celebration of 35 Years, which she used as a souvenir program for the concerts and sells on her website.  In 2014, she returned for the second season of The Voice of the Philippines and also joined the new Philippine version of The Voice Kids, on which she has appeared for three seasons, as of 2016. Salonga recorded a song called "Wished That I Could Call You" that was included in the charity compilation album Children In Need, released in March 2014. Also in 2014-15, she toured in Asia and North America with Il Divo. In mid-2015, she headlined her own concert series in Australasia. Salonga reprised her role as Kei Kimura in the 2015-16 Broadway production of Allegiance. Charles Isherwood wrote in The New York Times of her performance: "Her voice retains its plush beauty, and her culminating first act solo, "Higher" ... is perhaps the show's musical highlight."  Salonga guest-starred on the April 18, 2016 season finale of the American television series Crazy Ex-Girlfriend. She played Helen Bechdel in the international premiere of Fun Home in November 2016 in Manila. A review in ABS-CBN News said that she "delivers a finely tuned performance, utilizing her prodigious stage presence to provide the cold and dark shadings to erstwhile peppy scenes with her subtle stares and held back emotions. ... [In] "Days by Days" ... she finally lets go of all the resentment and repressed anger of a woman stuck in a marriage built on a lie. Yet there is dignity in her breakdown ... Salonga pulls it off with such clarity, both musically and emotionally, that it's difficult not to be moved.  In 2016 she won two more Aliw Awards, one for Best Major Concert in a Foreign Venue and her second Entertainer of the Year award. The following year, Salonga was one of the coaches on The Voice Teens. Salonga is currently portraying Erzulie in the 2017 Broadway revival of Once on This Island at Circle in the Square Theatre, where she is receiving critical praise for her vocal performance.

How many seasons was it on?
In 2014, she returned for the second season of The Voice of the Philippines