  We prove that for any m > 1 given any m-tuple of Hecke eigenforms $f_i$ of
level 1 whose weights satisfy the usual regularity condition there is a
self-dual cuspidal automorphic form $\pi$ of $\GL_{2^m}(\Q)$ corresponding to
their tensor product, i.e., such that the system of Galois representations
attached to $\pi$ agrees with the tensor product of the ones attached to the
cuspforms $f_i$.
