Warren continues to write hit songs for and with artists of all mainstream genres, including Celine Dion, Cheap Trick, En Vogue, Whitney Houston, Belinda Carlisle, Britney Spears, Marcia Hines, Alice Cooper, Christina Aguilera, Beyoncé, TLC, Aaliyah, Heart, Agnetha Fältskog, Elton John, Cher, Tina Turner, Bryan Adams, Selena, Jessica Simpson, Air Supply, Olivia Newton-John, Barbra Streisand, Aretha Franklin, Roberta Flack, Roy Orbison, Trisha Yearwood, Patti LaBelle, Michael Bolton, NSYNC, Rene Froger, Gloria Estefan, Reba McEntire, Enrique Iglesias, Paloma Faith, Russell Watson, Rod Stewart, RBD, Aerosmith, The Cult, Kiss, Ricky Martin, Faith Hill, Michael W. Smith, Meat Loaf, Sugababes, Mariah Carey, Toni Braxton, Exposé, Leigh Nash of Sixpence None the Richer, LeAnn Rimes, Gavin DeGraw, Kierra Sheard, Mandy Moore, Hilary Duff, Haylie Duff, Lindsay Lohan, Lady Gaga, Claire Richards, Starship, Westlife and so on, producing some of the songs as well. Her songs have been covered by artists including Joe Cocker, Weezer, Edwin McCain, Milli Vanilli, Mark Chesnutt, Sara Evans, among others.