Oops, how did that one get there? That’s not really a career.
Literally. For you’re the one with the voice. We’re just here to help you get it out.
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When a song is written by more than one person, it is co-written, or written jointly or in collaboration with another author.  Co-writers create songs in different ways. Some co-writers use a "stream of consciousness" approach, throwing out every single line or word or rhyme that comes to them. By letting ideas flow, this generates potential lyrics and song structures more effectively than trying to writing the song by discussing options. Co-writing can help two creators with different talents and strengths to create a new song that neither could have been able to devise if they were working alone.  The first step in co-writing is to establish the division of the contribution between co-writers. In copyright law, there is no distinction of importance between the lyrics of the song or the melody of the song, therefore each writer is given ownership equally over all of the song, unless another agreement is arranged.  "Phantom" songwriters are those who provided small contributions to the song, such as a band member who suggests a line for a verse or a session musician who informally proposes a chord progression for a coda. Once a songwriter is acknowledged as a cowriter on the project, this is almost impossible to undo, so "phantom" songwriters are not usually given credit.
A playwright writes plays which may or may not be performed on a stage by actors. A play's narrative is driven by dialogue. Like novelists, playwrights usually explore a theme by showing how people respond to a set of circumstances. As writers, playwrights must make the language and the dialogue succeed in terms of the characters who speak the lines as well as in the play as a whole. Since most plays are performed, rather than read privately, the playwright has to produce a text that works in spoken form and can also hold an audience's attention over the period of the performance. Plays tell "a story the audience should care about", so writers have to cut anything that worked against that.  Plays may be written in prose or verse. Shakespeare wrote plays in iambic pentameter as does Mike Bartlett in his play King Charles III (2014). 
composer "one who writes and arranges music," 1590s, from compose. Used in general sense of "one who combines into a whole" from 1640s, but the music sense remains the predominant one.