sentences:  Only Tallis, however, seems to have been inspired to match or out-do it, with his 40-voice "Spem in alium".In this motet, the singers were probably arranged in a full circle around the listeners.The imitation pattern that begins "Spem in alium" is the same as that which begins this closing Agnus Dei in the Striggio mass, which has been seen as evidence that it was indeed this piece which Tallis heard in London in 1567.