Table: symphony_concerto
Columns: cellist
orchestra
conductor
record_company
year_of_recording
format

Question: What is the oldest year that the Royal Philharmonic Orchestra released a record with Decca Records?
SQL: SELECT MIN("year_of_recording") FROM symphony_concerto WHERE "orchestra" = 'royal philharmonic orchestra' AND "record_company" = 'decca records'

Question: What format was conductor Erich Leinsdorf's album released on?
SQL: SELECT "format" FROM symphony_concerto WHERE "conductor" = 'erich leinsdorf'

Question: What record company released a CD in 1964?
SQL: SELECT "record_company" FROM symphony_concerto WHERE "year_of_recording" = 1964 AND "format" = 'cd'