The list of symphonies in A-flat major includes:
Havergal Brian (1968) Edward Elgar Symphony No. 1, Op. 55 (1907–8) Jef van Hoof Symphony No. 2 (1941) Hans Rott Symphony for Strings (unfinished; 3 movements survive) (Nowak 37) (1874–5) William Grant Still Symphony No. 1 in A-flat major, "Afro-American" (1930) Johann Baptist Wanhal Symphony in A-flat major, Bryan Ab1 (c.1772)Paul Bryan, Johann Waṅhal, Viennese Symphonist: His Life and His Musical Environment Stuyvesant: Pendragon Press (1997): 330. The manuscript copy at Donaueschingen gives the key as "A" while the one at Prague gives it as "Gis" (G sharp).
References