Examples described herein may perform various operations based on mood congruency. An example implementation accesses (i) a first mood vector that describes first media data and specifies a first mood-value pair, the first mood-value pair assigning a first value to a first mood and (ii) a second mood vector that describes a second media data and specifies a second mood-value pair, the second mood-value pair assigning a second value to a second mood. The implementation retrieves a first score that quantifies congruency between the first and second moods and generates a second score that quantifies congruency between the first and second mood vectors, the generating the second score being based on the accessed first and second values and the retrieved first score. Based on at least the generated second score, the implementation provides an indicator to an application.