19d One inspired by Greek tragedy - Academician with dramatic display for an audience (6)
?A?I?E
12d Beethoven's Opus 1 shows Angela mostly playing tennis (11) M?R?E?S?E?N
19d Racine - 'R(oyal) A(cademician)' + 'cine' ("scene", for audience) 12d Merkenstein - '(Angela) Merke(l; mostly)' + anag 'tennis' - "1" in the clue refers to the answer to 1a https://www.prestomusic.com/sheet-music/works/251008--beethoven-merkenstein-op-100/browse ^Not a great link, sorry...
19d Racine - 'R(oyal) A(cademician)' + 'cine' ("scene", for audience)
12d Merkenstein - '(Angela) Merke(l; mostly)' + anag 'tennis' - "1" in the clue refers to the answer to 1a