Donald Swann
The Road Goes Ever On (1967)
Bilbo’s Last Song (1978)
Lúthien Tinúviel (1993)

Leonard Rosenman
The Lord of the Rings Film Score (1977)

Stephen Oliver
The Lord of the Rings Radio Drama Score (1981)

Johan de Meij
The Lord of the Rings Symphony (1988)

Howard Shore
six film scores and a symphonic suite - too lazy to look up exact dates but they’re not exactly obscure

Got any others you like or any info to add?