user: Question: What format was conductor Erich Leinsdorf's album released on?
Columns: ['Cellist', 'Orchestra', 'Conductor', 'Record Company', 'Year of Recording', 'Format']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Mstislav Rostropovich', 'Royal Philharmonic Orchestra', 'Sir Malcolm Sargent', 'EMI', 1957.0, 'CD']
SQL:

assistant: SELECT "Format" FROM "Table" WHERE "Conductor" = 'Erich Leinsdorf';