Original: If available , clarinets in A should be used instead of clarinets in B-flat ; the A clarinets would be written in G major , while the B-flats would be written in F-sharp or G-flat major .
Simplified: When writing in E major , clarinets in A should be used instead of clarinets in B-flat to make it easier to play . This is because clarinets are transposing instruments .