A couple works come to mind:
Mozart trio for clarinet viola and piano - nicely paired with the clarinet quintet on a Harmonia Mundi Musique d'Abord disc.
Schubert octet - I have a couple of recordings, but no hands-down favorite.
Palestrina Masses? I have a nice set by the Tallis Scholars.
And to change genres, there's always Bill Evans and the Modern Jazz Quartet.
Mozart trio for clarinet viola and piano - nicely paired with the clarinet quintet on a Harmonia Mundi Musique d'Abord disc.
Schubert octet - I have a couple of recordings, but no hands-down favorite.
Palestrina Masses? I have a nice set by the Tallis Scholars.
And to change genres, there's always Bill Evans and the Modern Jazz Quartet.