FTP, name this 1906 work whose call for an unusually large chorus and orchestra resulted in the nickname the "Symphony of a Thousand".
This symphony was the best-received work of the composer during his lifetime, and it was the last of his pieces he saw premiered. It has only two movements: the first is a setting of the Latin hymn, "Veni creator spiritus".  The second movement can be divided into three sections that approximate the slow movement, scherzo, and finale of a traditional symphony.  As a setting of the final scene of Goethe's "Faust", its subject matter seems distant from the first movement, but the composer saw them in a similarly spiritual light.  FTP, name this 1906 work whose call for an unusually large chorus and orchestra resulted in the nickname the "Symphony of a Thousand".
This symphony was the best-received work of the composer during his lifetime, and it was the last of his pieces he saw premiered.
Mahler's 8th Symphony (Accept the Symphony of a Thousand before it is mentioned)