There are at least 5 artists with this name:

1. Krishnakumar Kunnath is an Indian playback singer from Kerala. He is a prominent singer in Hindi, Tamil, and Telugu films. His name is often confused with the similar screen name of a Bollywood actor, Kay Kay Menon.

Krishnakumar Kunnath was brought up in New Delhi. A graduate of Delhi University, he waited at tables for 6 months before he got his break, singing in a jingle for a commercial. He appeared in "Josh of India" song for the support of Indian Cricket Team during Cricket World Cup 1999. Following this,he released an album called 'Pal', the title song of which struck a chord with listeners. Another song titled "Yaaron" from the same album was also popular.

His first song for a Bollywood flick was "Chhod Aaye Hum" (Maachis). But it was the song "Tadap Tadap Ke Is Dil", from the movie Hum Dil De Chuke Sanam, that brought him into limelight.

Starting off from Hindi, he sang his way to the southern part of the country,singing in Tamil, Telugu, Bengali, Assamese and even Kannada; the song "Uyirin Uyirae" from the Tamil movie "Kakha Kakha" ("Cheliya Cheliya" from the Telugu movie Gharsanna) being one of the better-known songs. He has received six Filmfare Awards nominations, and a Filmfare Awards South.

Back in Bollywood, he notched up winners with songs such as "Tu Aashiqui Hai" from "Jhankaar Beats" (for which he received a National Award), "Chand Ki Roshni Se" from "Home Delivery" and the smash hit "Dus Bahaane" (with Shaan) from the film "Dus". Recently, his hit songs "Tu Hi Meri Shab Hai" from the movie Gangster, "Soniye Soniye" from "Aksar","Mera Pehla Pehla Pyaar Hai" from "Mera Pehla Pehla Pyaar Hai","Alvida Alvida" from "Life in a Metro" and "Kya Mujhe Pyaar Hai" from "Woh Lamhe" have cemented his place as one of Bollywood's most talented vocalists.
Official Website: www.themesmerizer.com.

His distinctive voice, which seems to get even clearer with the increase in pitch, and his style of rendition are his biggest assets. He created a rage in tamil with the song "Appadi Podu ". The reclusive singer finally came out of the shadows to be one of the judges in the popular reality show Fame Gurukul in 2005.

On 31 May 2022, KK performed at the Gurudas College Fest at Nazrul Mancha, Kolkata. He complained of feeling unwell soon after his performance on the way back to his hotel where he suffered a cardiac arrest. Efforts to revive him at the hotel were unsuccessful. He was subsequently taken to a hospital in Kolkata where he was declared dead on arrival. He was 53 years old at the time of his death.

2. KK (Kevin Kerrigan) is a British-based musician, composer and producer, who has worked with Brian Eno, Bjork, James Newton Howard and produces soundtracks for film and TV. He is musically known for making soundtrack-styled albums.

3. KK (Kristján Kristjánsson)is the name of an Icelandic Blues / folk singer. He has released numerous LPs with his band and with Magnús Eiríksson, as well as one Christmas LP with his sister Ellen Kristjánsdóttir. A biography of KK by Einar Kárason was published in 2002. His most recent LP is Svona Eru Menn from 2008.
http://kk.is/

4. KK (the khaosist) is Tokyo Based
Hip-Hop Beat Maker/Producer.After various musical accomplishments (arranger, keyboardist, production of singer Kaana, and guest appearance on DJ Krush “Kakusei” ), founded Lo-Vibes Recordings and released first solo album “Vibration-Lo” (2000). Since, he has produced rap artists such as Shing02, Kei-Bomb, ARI1010 and Dragons of Edin, and released several instrumental works.
http://www.lo-vibes.com/

5. KK is a singer on the Japanese video site Nico Nico Douga who uploads covers of popular Vocaloid songs.
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Artist biography from last.fm