Complex sentence: In the 1970s it was adopted by WGN as the theme music to "The Ray Rayner Show" (Ray Rayner used Warner Bros. cartoons on his show) and in 1995 it was used as the ending theme of "Sylvester and Tweety Mysteries".
Split into simpler sentences: In the 1970s it was adopted by WGN as the theme music for "The Ray Rayner Show", which featured Warner Bros. cartoons. In 1995, it was used as the closing theme of "Sylvester and Tweety Mysteries".