No. 1 rap single, ASCAP's "Song of the Year", and reached No. 5 on the Billboard pop chart. In addition to producing and writing, he scouted new talent and managed, Stewart jump-started the careers of artists such as Solé and Blu Cantrell. In 2000, Tricky co-wrote and produced Interscope artist Mýa's breakthrough single "Case of the Ex", It peaked at number 2 on the Billboard Hot 100 in December 2000, and stayed in the Top 10 for three months. While Mya's song was still on top, Stewart discovered and signed Blu Cantrell, and went on to executive produce her debut album So Blu on Arista Records. It peaked at No. 8 on the Billboard 200 album chart and spawned the No. 2 hit "Hit 'em Up Style (Oops!)". In 2002, Stewart co-produced and co-wrote B2K's debut single, "Uh Huh". It was No. 1 on the Billboard Hot 100 for 10 weeks. In 2003, Blu Cantrell's second album, Bittersweet, was released; it features three songs produced by Stewart, "Unhappy", "Holding on to Love" and "Let Her Go". He also co-wrote and produced a number of songs for Britney Spears's fourth album, In the Zone (2003), including two of its singles, "Me Against the Music" and "Outrageous", as well as "Early Mornin'" and "The Hook Up". 2006–present 2007 was a breakthrough year for Stewart and RedZone Entertainment. Rihanna's single "Umbrella", co-written with The-Dream, garnered two Grammy nominations for Record of the Year and Song of the Year, and a Grammy for "Best Rap/Song Collaboration. In an interview with MTV, Stewart said Released in March 2007, "Umbrella" topped the Billboard Hot 100 chart by May, rising 40 spots in one week to land and stay seven straight weeks at number one. The song also broke the iTunes music store's record for biggest debut ever. The success brought Rihanna to a new level of fame, co-writer The-Dream went on to debut his own hit record "Love Hate" (executive produced by Stewart), which included the hit single "Shawty is a 10" peaking at No. 6 on the Billboard Hot R&B/Hip-Hop Songs. He also co-wrote and produced Dream's, "Falsetto" and "I Luv Your Girl". In late 2007, Stewart was working with notable artists as Janet Jackson, Celine Dion (Skies of L.A. off her new album "Taking Chances"), and Usher ("Moving Mountains" and "This Ain't Sex" of his new album Here I Stand). Stewart was also nominated