  This paper means to correct an error by the authors for the composite $q$
case in the paper "Lens Spaces, Isospectral on Forms but not on Functions",
published in LMS J. Comput. Math.} 9 (2006), 270-286. All calculations and
examples presented in \cite{GM} for prime $q$ remain valid, and we include
detailed calculations below justifying this. Our original mistake was to
conclude that Formula (3.11) \cite[p. 399]{Ikeda} remained true for all $q$
when in fact it is only valid if $q$ is prime. This means formulas (3) and (4)
in \cite{GM} must be reworked to account for complications when $q$ is
composite.
