Many beautiful piano solos emote great feelings in my soul as I listen and as I play them. Some are: Rachmaninoff's Elegie (Opus 3, 1); several preludes: Opus 23: 1, 4, 6 and 10 and Opus 32: 2, 5, 10 and 12; Vocalize; Moments Musicaux: Opus 16: 1, 3, 4; and the Second Piano Concerto. Chopin: Nocturnes: F# Major (Opus 15, 2), C# minor (Opus 27, 1) and D flat Major (Opus 27, 2), B Major (Opus 32, 1), G minor (Opus 37, 1), C minor (Opus 48, 1) F# minor (Opus 48, 2) E minor (Opus 72, 1); Ballade 4; Brahms: Intermezzo (Opus 118, 2); Debussy: First Arabesque, Claire de Lune, Reverie, Ballade and Nocturne; Grieg's Sonata; Ravel's Pavane; Beethoven: several Sonatas, or movements within; Liszt: Etude in D flat Major...
I could go on and on, but I'd rather be playing!