Final answer:
A song that is a hit in multiple music market segments is called a crossover hit, indicating its popularity across different genres.
Step-by-step explanation:
A song that is a hit in more than one segment of the music market is referred to as a crossover hit. When a song achieves popularity across different music genres or charts, it can be considered a crossover. For example, it may be that a song is not only popular on the pop charts but also on the country, R&B, or dance charts.
Having appeal in various musical genres is not an easy feat, and when artists or bands accomplish this, it reflects both a broad appeal and the ability to connect with a diverse audience.