Clarence Gittins Pleases Audience At Grace ChurchSeveral Hundred Music Lovers Hear Boy SopranoSeveral hundred music lovers attended the final Choral Evensong of the season at Grace Episcopal Church last night and heard Clarence Gittins, eminent boy soprano soloist at St Thomas Church in New York cityA voice of surpassing loveliness, the fine, sonorous soprano of Clarence Gittins offered the inspiring solo. Were You There, followed b Handel's difficult arrangement of I Know That My Redeemer Liveth. The great anthem by Gounod, Unfold Ye Portals, was rendered by the Grace Church Choir, under the direction of Hart Giddings. organist. The solo part was sung by Master Gittins. Other hymns sung by the choir were O Lord Most Holy by Franck-Vesper hymn; Rejoice the Lord is King by Parker-Recessionai.The Rev Samuel Mitchell of Monticello and several members of the Junior Choir of the Episcopal Church at Monticello were also guests last night The Rev. Harold L. Andress, rector here, led in prayer. _