Mikael Rasmuson replies to me:

>>...  Who was the 19th-century guy who wrote three oratorios, designed
>>to be performed separately or simultaneously? He was probably engaged in
>>contrapuntal feats that make Bach's efforts seem positively puny, but who
>>cares?
>
>Are you referring to Liszt and "Christus"?

No. Nobody that well-known today.

Steve Schwartz