The artists themselves are usually coauthors with other people they collaborate with. I'm not aware of a modern day figure with an analogous role to one someone like Irving Berlin had at the time. The songs that chart today are lyrically new and are not new covers of songs from 10-20 years ago. There is no more Great American Songbook in the sense of songs that are written once and covered many times.
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The artists themselves are usually coauthors with other people they collaborate with. I'm not aware of a modern day figure with an analogous role to one someone like Irving Berlin had at the time. The songs that chart today are lyrically new and are not new covers of songs from 10-20 years ago. There is no more Great American Songbook in the sense of songs that are written once and covered many times.