Christina María Aguilera

Since her debut in 1999 Aguilera has been compared to the likes of Mariah Carey and Whitney Houston. David Browne of The New York Times writes, "Aguilera has been one of the foremost practitioners of the overpowering, Category 5 vocal style known as melisma. Ms. Carey, Ms. Houston and Ms. Aguilera, to name its three main champions, are most associated with the period from the late ’80s through the late ’90s." A review in the Los Angeles Times compared Aguilera's vocal stylings to Barbra Streisand, Gladys Knight, and Aretha Franklin adding, "Aguilera's Streisand-esque tendencies are a good thing; they're helping her figure out how to become the "great singer" she's been dubbed since she released her first single, the wise-beyond-its-years "Genie in a Bottle", at 18." Although praised for her vocals, Aguilera has been labeled for oversinging in her songs and concerts. Longtime producer and writer, Linda Perry, commented on working on the record, "Beautiful", saying, "I tried to keep it straight. I told her to get rid of the finger waves. Every time she'd start going into "hoo-ha", I'd stop the tape. I'm like, 'You're doing it again.'" Perry ended up using the first take saying, "She had a hard time accepting that as the final track. It's not a perfect vocal – it's very raw. She knows her voice really well, and she knows what's going on. She can hear things that nobody else would catch."
• Themes and musical style
The constant theme in Aguilera's music and lyrics is love, although she has written on other subjects including spirituality, female empowerment, and grief. Aguilera has also written about her childhood in two of her records which dealt with domestic abuse. In an interview Aguilera admitted she feels responsible to reveal her most vulnerable feelings and to share the darker sides of her life adding "People that can relate might not feel as alone in the circumstance." She has been noted to constantly changing her sound in her music and lyrical content. Originally marketed as a bubblegum pop singer during the late 90s pop scene, she quickly departed into a broad range of musical genres for her follow-up album Stripped. A review states, "Clearly afflicted with Premature Serious Artist Syndrome, Aguilera wants to demonstrate the range of her interests – vampy soul, quasi-metal, piano-bar intimacy, quiet-storm R&B, bounce-bounce hip-hop, and semi-exotic rock, all of it dutifully accomplished."
The majority of the songs are characterized by Aguilera's loud vocals, though she has used breathy and soft vocals. Her 2006 release, Back to Basics included producer DJ Premier. The New York Times exclaims, "Her decision to work with the low-key DJ Premier was also a decision to snub some of the big-name producers on whom pop stars often rely." Aguilera has often cited that she prefers working with producers that are not in popular demand, saying "I don't necessarily go to the main people that are the No. 1 chart-toppers in music." The album included live instrumentation and samples of past jazz and soul records. Some tracks on the album included non-traditional forms of pop music such as swing jazz and big band, drawing comparisons to Madonna's I'm Breathless and the musical film Cabaret. Her first feature film, Burlesque, influenced by Cabaret, featured mainstream producers Tricky Stewart and Danja on the soundtrack where several established songs were updated and worked into dance numbers, a style similar to 2001's Moulin Rouge! "Diamonds Are a Girl's Best Friend" was performed by Aguilera in the film, a musical number also performed by Nicole Kidman in Moulin Rouge!