From NPR: "Edward Hirsch, author of 'A Poet's Glossary,' says poetry has its roots in song — in the beginning, a poet was a troubadour. 'There are still many tribal cultures where poetry and song, there is just one word for them,' Hirsch explains. 'There are other cultures with literacy where poetry and song are distinguished. But poetry always remembers that it has its origins in music.' Hirsch says the merger of poetry and music … has made a big comeback with performance poetry and rap."