user: Question: What was the format for catalog 660-51-015?
Columns: ['Region', 'Year', 'Label', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United States', 'May 1974', 'Strata-East Records', 'stereo vinyl LP', 'SES-19742']
SQL:

assistant: SELECT "Format" FROM "Table" WHERE "Catalog" = '660-51-015';