Contempoarary composers who are not well known are not well represented in many of these resources. An example for classical music is:
Brandon Waddles:
Not in Grove Music Online
Not in any of the specialized reference sources
Not in Wikipedia
Indexes and the composer's website may be the answer or the composer's place of employment or their publisher's website
His website: https://brandonwaddles.com/bio
Useful for biographical information
Brandon Waddles - Department of Music https://music.wayne.edu
Artist - Waddles, Brandon - GIA Publications https://www.giamusic.com
Scholarly indexes, such as RILM Abstracts, Music Periodical Index, have information about this composer
