A person who composed a piece of music; the composer credited for a musical work.
この曲の作曲者は有名な作曲家だ。
The composer of this piece is a famous composer.
CDのライナーノーツに作曲者と作詞者が記載されている。
The liner notes on the CD list the composer and lyricist.
作曲者に連絡を取り、演奏許可を得た。
I contacted the composer and obtained permission to perform.