An accomplished pianist, Keys incorporates piano into a majority of her songs and often writes about love, heartbreak and female empowerment. She was inspired by several musicians, including Prince, Nina Simone, Barbra Streisand, Marvin Gaye, Quincy Jones, Donny Hathaway and Stevie Wonder. Keys' style is rooted in gospel and vintage soul music, supplemented by bass and
programmed drumbeats. She heavily incorporates classical piano with R&B, soul and jazz into her music, but began experimenting with other genres, including pop and rock, in her third studio album, As I Am. Patrick Huguenin of the New York Daily News stated that her incorporation of classical piano riffs contributed to her breakout success. Jet magazine states she "thrives" by touching her fans with "piano mastery, words and melodious voice". The Independent described her style as consisting of "crawling blues coupled with a hip-hop backbeat", noting that her lyrics "rarely stray from matters of the heart". Blender magazine referred to her as "the first new pop artist of the millennium who was capable of changing music."
Keys has a vocal range of a contralto, which spans three octaves. Often referred to as the "Princess of Soul", Keys has been commended as having a strong, raw and impassioned voice; others feel that her voice is "emotionally manufactured" at times and that she pushes her voice out of its natural range. Keys' songwriting is often criticized for lack of depth, which has led to her writing abilities being called limited. Her lyrics have been called generic, clichéd and that her songs revolve around generalities. Greg Kot of the Chicago Tribune feels that she "[pokes] around for multi-format hits rather than trying to project any sort of artistic vision". Diversely, Jon Pareles of Blender magazine stated that the musical composition of her songs makes up for their lyrical weakness, while Gregory Stephen Tate of The Village Voice compared Keys' writing and production to 1970s music.
Joanna Hunkin of The New Zealand Herald reviewed one of Keys' performances, where Kylie Minogue also attended. She described Minogue's reaction to Keys' performance, saying "it was obvious she was just as much of a fan as the 10,000 other people at Vector Arena". She went on to say that Minogue was "the original pop princess bowing down to the modern-day queen of soul". Hunkin characterized Keys' opening performance as a "headbanging, hip-gyrating performance" and her energy as "high-octane energy most bands save for their closing finale". At the end of her two-hour performance, fans "screamed, stomped and begged for a second encore". Hillary Crosley and Mariel Concepcion of Billboard magazine noted that her shows are "extremely coordinated" with the audience's attention span "consistently maintained". The show ended with a standing ovation and Keys "proved that a dynamic performance mixed with superior musicianship always wins". Throughout her career, Keys has won numerous awards and is listed on the Recording Industry Association of America's best-selling artists in the United States, with 14 million certified albums. She has sold over 30 million albums worldwide and has established herself as one of the best-selling artists of her time.
