Prof. Stanley has annonnced the list of attractions for the May festival of music, beginning Tbursday evening, May 31, and continuing three days. On Thursday eveoing will be given a Wagner concert, the flrst part oonsisting of a miscellaneous program, and the seccnd being the entire flrst act of "Lohengrin." Friday afternoon will be given up to a symphony concert; Friday evening to a miscellaneuus program, Satxirday afternoon to a great orchestral concert, and Saturday eveniug to Saint Saen's ''Samson and Delilah." The soloists engaged are : Sopranos, Frau Katrine Lohse Klafsky aml Miss Rose Stewart; coutraltos, the Misses Gertrude May Stein and Katberine Bloodgood ; tenors, Evans Williams and Baron Berthold ; baritones, Leandro Campanari, Max Heinrich and Gardner S. Lamson. Alberto Jonas will act as pianist and Herman A. Zeitz as violinist, and the orohestra will be the Boston Festival orchestra. To these is added the great Choral Union, with its 300 voices. The festival is expeoted to far eolipse those that have preceded it.