Producer Mark Ronson, who worked closely with Amy Winehouse on her acclaimed 'Back to Black' album, is devastated about her death.

Ronson posted a single tweet on Saturday after the news broke: "she was my musical soulmate & like a sister to me. this is one of the saddest days of my life."

Ronson isn't the only one of Winehouse's musical partners who is heartbroken by the news. Winehouse's other principal collaborator on 'Back to Black,' Salaam Remi, also tweeted his reaction: "Very Very Sad Day. Just lost a Great Friend and a Sister. RIP my baby SiS Cherry Winehouse. Love ya always."

Meanwhile, Sharon Jones & the Dap Kings and the Daptone Records family, many of whom recorded with Winehouse, sent the following statement to Us Weekly:

"We are very sad to have lost Amy Winehouse today. She was one of a kind and we were fortunate to have had the chance to make music with her. She was always gracious and a pleasure to work with in the studio and on the road. She brought a lot of people joy with her voice and her irreverent personality. It is a tragedy that she was taken from us so soon when she had much more music to give."

Plenty of other musicians have tweeted their reactions to Winehouse's death, and the singer's parents also spoke out publicly.

Watch Mark Ronson and Amy Winehouse Perform at the 2008 Brit Awards