In music, Op. 123 stands for Opus number 123. Compositions that are assigned this number include:

• Beethoven – Missa solemnis
• Ries – Piano Concerto No. 6
• Saint-Saëns – Cello Sonata No. 2
• Schumann – Festival overture on the Rheinweinlied for orchestra and chorus

Topics referred to by the same term

This disambiguation page lists compositions catalogued to the same opus number.
If an internal link led you here, you may wish to change the link to point directly to the intended article.