O Salutaris Hostia
is a work for Unaccompanied SATB chorus by composer David Hill
that sets the 'Hymn for the feast of Corpus Christi' by St. Thomas Aquinas. The piece lasts around 2 minutes.
Please note the lyrics are in Latin.
A review in the June 2016 edition of Organist's Review says that this work is "to be heartily recomended, and of use at any Eucharistic service and most especially that of Corpus Christi."