Is your feature request related to a problem? Please describe.

Non vanilla mobs who have boss healthbars are treated like normal enemies when used in mob events, causing their theme to sometimes play at inoppurtune moments.

Describe the solution you'd like

Allow mobs that have boss healthbars to force their music to play as long as their healthbar is on screen like the Wither and Ender Dragon Events.

Describe alternatives you've considered

An entirely separate "Health Bar" event that would allow you to specify a music track that will play when a specific healthbar is on screen. (I don't know how players would be able to specify healthbars, though)
OR
A modular version of the event.bossWither and Ender Dragon events that can be used for every mob classified as a boss, allowing players to specify one specific mob rather than the currently existing eventBoss, which affects all boss mobs.

Additional context

When fighting the Ferrous Wroughtnaught from Mowzie's Mobs while he's set to play music, the music will not start until he lands an attack on you. He's also a boss who only has one attack that isnt easily dodged, so you could potentially go the whole fight without hearing the music. By default in newer versions of the mod, he has a boss healthbar, though. So it'd be ideal that it be possible to make music play while the healthbar is on screen. I would use the boss event, but that applies to every boss mob, and I want specific bosses to play a specific theme.