Washington, May 11 -- Grammy-winning artist John Legend has opened up about his former collaborator Kanye West, calling the rapper and producer's transformation over the past two decades both "sad" and "sometimes shocking."

In an interview, Legend reflected on their creative partnership while making his debut album, 'Get Lifted', released in 2004.

West served as executive producer on the record, contributing alongside names like Dave Tozer, will.i.am, and Devo Springsteen.

Released under West's GOOD Music label, Get Lifted sold over three million copies, earned three Grammy Awards, and helped launch Legend into stardom.

At the time, West was also riding high on his own success, with his debut album The College Dropout establishing him...