I am looking for any event in the movie industry where my father, Seymour Burns, is mentioned

My name is Ronnie Burns and I am the son of the late Seymour Burns (aka Sioma Berengarten, Sioma Berngarten) who worked in the Hollywood film making industry in the 20's of the previous century. My father was the music composer of "The Doctor's Secret", a film produced in 1929 by Paramount.  My cousin, Richard Burns, aka Richard Berengarten, the son of Alex Burns from London, is as interested to formulate a clearer picture of the two brothers' family history. We have been trying to discover any information regarding my Father's activities in Hollywood but could find only one lead in IMBD.  It would be so very important for our family to know more.  We also would be very interested to find any information regarding Rose Berengarten, the older sister of Alex and Seymour.  Following her marriage she became Rose Disraeli.  She lived all her adult life in Hollywood and as a singer, dubbed songs for Hollywood's stars. If you could share with us any contact that could shed light on the subject, we could be able to construct a more defined picture of our family's story.    Thank you so much for your attention