Example of classical music beginning on minor or major key?

Beginning on a minor key:

* Beethoven's Symphony No. 5 in C minor

* Bach's Toccata and Fugue in D minor

* Mozart's Piano Concerto No. 20 in D minor

Beginning on a major key:

* Beethoven's Symphony No. 9 in D major

* Bach's Brandenburg Concerto No. 3 in G major

* Mozart's Clarinet Concerto in A major