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The singer signed with Lukasz Gottwald, known as Dr. Luke, in 2005 under his label Kemosabe Records, which is owned by Sony. The contract requires her to record six additional albums.
After Kesha, whose full name is Kesha Rose Sebert, accused him of emotional and sexual abuse in a 2014 lawsuit, Dr. Luke responded with a countersuit.
Dr. Luke posted a series of tweets Monday defending himself and denied raping Kesha.
I didn't rape Kesha and I have never had sex with her. Kesha and I were friends for many years and she was like my little sister.
- Dr. Luke Doctor Luke (@TheDoctorLuke) February 22, 2016
Fans and other celebrities have rallied behind Kesha with the #freekesha movement.
The singer responded to support from fans and celebrities with an Instagram post.
She said: "I am beyond words in gratitude. thank you is not enough but it is all I have. a million times over and forever thank you. the support I have received has left my face swollen from tears. I love you all so much."
Kesha added that a larger statement is forthcoming.