Brahms Clarinet Sonata, Op.120/2
The superb Scandinavian clarinet player, Martin Fröst, with his pianist Roland Pontinen and the cellist Torleif Thedeen, are on the BIS label, BIS SACD1353 (full price), and include both Clarinet Sonatas and the Clarinet Trio. The performances are superb, and the recording quality is up to BIS’s usual high standard. This is my first choice for both works. The budget choice is included in the Beethoven paragraph above. Mention must be made of the excellent recording of the 2 Clarinet Sonatas by Michael Collins and Michael McHale on Chandos CHAN 10844 (full price), which includes works by Carl Reinecke.
Beethoven Cello Sonata, Op.69
All the Cello Sonatas and Variations are included in a fine medium priced 2 disc set from Channel Classics (CCSSA 22605-SACD). Pieter Wispelwey (cello) and Dejan Lazic (piano) are the very able performers, and the recording quality is excellent. A very good, fairly new, budget alternative, is provided by Timora Rosler (cello) and Klara Wurtz (piano) on Brilliant Classics 94624.
Brahms Clarinet Trio, Op.114
My prime recommendation is shown above, but a pleasing budget alternative, which includes the Brahms Clarinet Quintet, is on Naxos 8.550391. Józef Balogh (clarinet), Jeno Jandó (piano), and the Danubius Quartet are the experienced performers.
All the SACD’s mentioned play on standard CD players.