Who is more important, the composer or the performer?

Please, someone answer!  Give me a sign from above!  Anything!

(I'll quote from the end of Strauss' final opera, "Capriccio," where poetry
and music compete for supremacy):

"Your dinner is served."

(....diddle diddle dum dum, diddle diddle dum dum, diddle diddle diddle
diddle dum dum.)

John Smyth