user: Question: What US Country released an album of singles only in 1967?
Columns: ['Year', 'Single', 'U.S. Country', 'U.S.', 'U.S. AC', 'Album']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1957.0, '"Roll O\' Rollin\' Stone"', '—', '—', '—', 'singles only']
SQL:

assistant: SELECT "U.S. Country" FROM "Table" WHERE "Album" = 'singles only' AND "Year" = 1967.0;