A shorter version, which most English speakers would find OK I think would be: "There will be a Beethoven concert today". This means the music would be by Beethoven - but performed by other, living people!The problem is either with the original or with the translation.
I can only guess that the original didn't intend to say that a dead composer and pianist is going to perform. More likely, it tried to say that —
1— There will be a musical performance today.
2— The performance will include works by Beethoven.
3— The performer(s) will be ______________.