William Henry Marcus Miller Jr. is an American film composer, jazz composer, record producer, arranger, and multi-instrumentalist, best known as a bassist. He has worked with trumpeter Miles Davis, pianist Herbie Hancock, singer Luther Vandross, and saxophonist David Sanborn, among others.
Mark Daniel Ronson is a British-American DJ, songwriter, record producer, and record executive. He is best known for his collaborations with artists such as Amy Winehouse, Adele, Lady Gaga, Lily Allen, Robbie Williams, Miley Cyrus, Queens of the Stone Age, and Bruno Mars. He has received seven Grammy Awards, including Producer of the Year for Winehouse's album Back to Black and two for Record of the Year singles 'Rehab' and 'Uptown Funk'. He received an Academy Award, a Golden Globe Award and a Grammy Award for co-writing the song 'Shallow' for the film A Star is Born (2018).