The sonatas composed in chamber style for several instruments seem to have been imposed on the Church by Salzburg custom of the time. Following in his father's footsteps, W.A. Mozart composed 17 such sonatas between 1772 and 1780. Their structure, with a single usually rapid movement stems from the purest Baroque style, yet they belong amongst the founding works of Classical style and the concertante aspect of some of them is really stunning!

• Mozart: Church (Epistle) Sonata No. 1 in E flat major for organ & strings, K67
• Mozart: Church (Epistle) Sonata No. 2 in B flat major for organ & strings, K68
• Mozart: Church (Epistle) Sonata No. 3 in D major for organ & strings, K69
• Mozart: Church (Epistle) Sonata No. 4 in D major for organ & strings, K144
• Mozart: Church (Epistle) Sonata No. 5 in F major for organ & strings, K145
• Mozart: Church (Epistle) Sonata No. 6 in B flat major for organ & strings, K212
• Mozart: Church (Epistle) Sonata No. 7 in F major for organ & strings, K224
• Mozart: Church (Epistle) Sonata No. 8 in A major for organ & strings, K225
• Mozart: Church (Epistle) Sonata No. 9 in G major for organ & strings, K241
• Mozart: Church (Epistle) Sonata No. 10 in F major for organ & strings, K244
• Mozart: Church (Epistle) Sonata No. 11 in D major for organ & strings, K245
• Mozart: Church (Epistle) Sonata No. 13 in G major for organ & strings, K274
• Mozart: Church (Epistle) Sonata No. 15 in C major for organ & strings, K328
• Mozart: Church (Epistle) Sonata No. 17 in C major for organ & strings, K336