On his 80th birthday , NUMBER@1 July NUMBER@2 , PERSON@1 conducted musicians from both orchestras at a Proms concert in LOCATION@1 .

On his 80th birthday , NUMBER@1 July NUMBER@2 , PERSON@1 conducted musicians from both these orchestras at a Proms concert in LOCATION@1 , conducting music by PERSON@2 and PERSON@3 .
