You can use music for subconsious mood setting. This is also used within shops. It will take away rationality and opens up for impulses. Opening sensors, collecting more information and increasing the sensitivity for emotional argumentation.
Each digital signage play list should be entertaining at least, but there is a difference between fun and humor. Tom & Jerry slapstick kind of fun draws attention but does not communicate. Humor however is communication.
Today conventional flatscreens can be replaced by very large LED displays that can be configured specifically and cover many square meters. So we take a given location and fit a display into it, that can be mounted and seen from all angles and from even the most remote position.