A funeral Mass may be celebrated as a low Mass in the case of the poor only. Otherwise, it shall be celebrated as a sung (high or solemn) Mass, if this is at all possible; every contrary practice is reprobated and must be eliminated as an abuse. The lack of an organist or of a choir cannot in itself be considered a valid excuse for a funeral Mass without chant, since an organist is not required and since the singing of the choir-parts by one person only would in a case of necessity be sufficient.
I might be mistaken about this. See a previous thread:the Libera me and responses must be sung on any other occasion
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