Music icon Bob who wrote the song suggested by the starts of this puzzle's theme entries

• Poet Thomas
• Thomas of poetry
• Name associated with classic rock
• A Thomas from Wales
• Bob who sang "A Hard Rain's A-Gonna Fall"
• Folk singer Bob
• Thomas, the poet
• He's been on the Never Ending Tour since 6/7/1988
• Bob who won the 2016 Nobel Prize in Literature

Wikipedia Word definitions in Wikipedia
Dylan is a 1964 play by Sidney Michaels .