It doesn't surprise me at all that you don't know who Nelson Riddle is. He was an orchestra/band leader with hits in the 40's, 50's and 60's, working with Frank Sinatra, Dean Martin, Judy Garland and others of the day. Later he worked with Linda Rondstat and did some TV and movie themes. He had some really big hits back in the day. 'Lisbon, Antiqua' is one of my favorites.
I think he died before Whitesnake even hit the charts.
I'm seriously old.