Short answers, pulled from the story.
A musician is defined by the United States Employment Service as someone who follows music as a career. This professional designation encompasses a vast spectrum of human creativity ranging from solitary songwriters to conductors directing dozens of players.
The composer is the architect of silence who creates the structural framework that allows music to exist. This title is principally reserved for those who write classical music or film scores where the creation of a composition is the primary goal unlike the songwriter who might focus on the immediate impact of a popular song.
The conductor stands on a raised podium acting as the visual and auditory bridge between the written score and the live performance. Conducting is defined as the art of directing the simultaneous performance of several players or singers by the use of gesture to ensure every section enters at the correct moment and with the desired intensity.
A music performer is generally either a singer also known as a vocalist who provides the human voice as an instrument or an instrumentalist who plays a musical instrument. These performers may work alone to create an intimate connection with the listener or they may join a group band or orchestra to create a richer soundscape.
A music producer plays a crucial role in shaping the sound of an album or song often acting as the invisible shaper of the final product. They oversee the recording process and guide the overall creative direction while collaborating closely with artists musicians sound engineers and other industry professionals.