Possible Clues:

• Wolfgang Amadeus --, Austrian composer
• The composer can be found in an OZ mart
• Magic Flute composer
• Mr A to Z in composing?
• Wolfgang Amadeus ...
• According to legend, at age 2 he identified a pig's squeal as G sharp
• Musician from Australia in the marketplace
• His music inspired ''Song Sung Blue''
• 'The culminating point that beauty has attained in the sphere of music,' per Tchaikovsky
• Composer of Don Giovanni, d. 1791