Seems rather odd that I can enter where a work was premiered (via the Area → Premiered in" relationship), and even who commissioned it (via Artist → Commissioned by), but not who played that premiere.
For more modern works, I guess you'd do that by entering a recording in the catalog. But I'm tagging classical, and the premiere predates recording technology.
With far more research (or again with more modern works), possibly I could enter an event in—but I don't have that information, and making up a pseudo-event ("That time so-and-so quartet played whoever back in 1860") doesn't seem like a sane approach.
Seems like there should be a relationship for who played the premiere.