The score for this cartoon was featured on the audio CD "Tom & Jerry & Tex Avery Too!".
Dancing bears were a staple in the circus shows of the era and before.
Television was not yet a staple in most homes at the time of this cartoon's release. So a large radio and a phonograph machine (monoaural) would have been the focal point for family entertainment, as well as musical instruments. The items shown here are accurately depicted. Radio shows were extremely popular then, the same as TV shows eventually would be.
Contrary to above item, almost 80 percent of US homes had a television in 1956. There's no TV depicted because it's not part of the plot or action.
Both Tom and Jerry break the fourth wall using their facial expressions.