user: Question: Who composed the work conducted by Jaroslav Vogel? 
Columns: ['Record label', 'Composer', 'Work title', 'Part', 'Conductor', 'Recording year']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Supraphon', 'Leoš Janáček', 'Jenůfa', 'Jano', 'Jaroslav Vogel', 1952.0]
SQL:

assistant: SELECT "Composer" FROM "Table" WHERE "Conductor" = 'Jaroslav Vogel';