Director John Singleton and Universal Pictures president of film music and publishing Mike Knobloch have been added to the fourth installment of the annual IMS Engage Hollywood summit, which will take place on April 21 at the W Hotel in Hollywood.

The International Music Summit, which also hosts annual conferences in Ibiza and Singapore, matches figures from within and without the electronic dance music community for wide-ranging chats and debates, having hosted Quincy Jones, Lyor Cohen and Chuck D at last’s year’s event.

Singleton and Knobloch join previously announced panelists including Live Nation’s James Barton, producer Arthur Baker, Tag Strategic’s Ted Cohen, AM Only’s Lee Anderson, Sonos CEO John MacFarlane and WME’s head of music Marc Geiger.

Music industry commentator Bob Lefsetz will also speak on a panel alongside longtime DJ and IMS co-founder Pete Tong.