By fifteen years of age , PERSON@1 had graduated from ORGANIZATION@1 in LOCATION@1 and appeared as a soloist with the ORGANIZATION@2 in a performance of the Tchaikovsky : Rococo Variations .

By the time he was fifteen , PERSON@1 had graduated from ORGANIZATION@1 in LOCATION@1 and appeared as a soloist with the ORGANIZATION@2 playing PERSON@2 's ` Variations on a Rococo Theme .
