A service of music in memory of the late Ralph Vaughn Williams will be presented by the Harvard University Choir at 8 p.m. tomorrow in Memorial Church. John Ferris, choirmaster, will be the organist.

The major work of the service in memory of the eminent English composer who died this year will be his "Five Mystical Songs," poems by by George Herbert set for baritone solo and chorus. John Horner, from the New England Conservatory of Music, will be the soloist. Motets and organ works by Williams will make up the remainder of the program.

This service will mark the first major performance of the University Choir which has included Radcliffe singers.

It will also be its first major performance since it separated from the Harvard Glee Club. Since the two groups have different directors this year, Choir members are no longer obliged to belong to the Glee Club.