In Japan, there are character songs which are sung by a fictitious character. The artist credit is expressed as follows:

character (voice actor)

See e.g. http://musicbrainz.org/release-group/abeb12c3-339e-418e-b54c-a0d83b794ac4

However, in addition to character song roles, the voice actor often has their own musical career and thus has songs released under their actual name. In that case, their own songs and the character songs will be mixed in the artist's discography. It is easy to display only entities released under the artist's real name by using the filter function. However, it is difficult to display only the character songs. See e.g. http://musicbrainz.org/artist/e9c4de4d-b5cd-4609-879c-6c51baf2be5b

This is related to the method of expression of Artist Credits.

My idea: Add new secondary type for character songs