There are limitations and they are likely dependent on the audio file format.
However I don't have problems with multiple artist like
Kremer, Gidon [Violin]; Meyer, Sabine [Clarinet]; Hagen, Veronika [Viola]; Hagen, Clemens [Cello]; Maisenberg, Oleg [Piano]
or
Henschel, Dietrich [Baritone]; Begley, Kim [Tenor]; Hollop, Marcus [Bass]; Fischer-Dieskau, Dietrich [Baritone]; Orchestre et Choeur de l'Opéra National Lyon; Nagano, Kent [Conductor]