Tolkien-based MUSH

There are numerous MUSH sites dedicated to the works of J. R. R. Tolkien.

Most notably :
Elendor-based on Third Age, timeframe is set before the quest of the ring. Knowledge of the The Lord of the Rings trilogy is required.

Beleriand(mush)-based on First Age, after the exile of Noldor and establishment of various elven cultures. The Silmarillion is the primary reading material and requirement.