Amanda Palmer paid tribute to David Bowie earlier this year alongside LA musician Jherek Bischoff, by releasing an EP of covers. Now, the two have collaborated again to pay homage to Prince with a 10-minute string-quartet version of Prince's iconic ballad 'Purple Rain.' Proceeds from the recording are going to Sheila E.'s nonprofit Elevate Hope Foundation, which offers music-based therapy to abused and abandoned kids. Listen below.