  We study separability of scalar, vector and tensor fields in 5-dimensional
Myers-Perry spacetimes with equal angular momenta. In these spacetimes, there
exists enlarged symmetry, $U(2) \simeq SU(2) \times U(1)$. Using the group
theoretical method with a twist, we perform the dimensional reduction at the
action level and show that both vector and tensor field equations can be
reduced to coupled ordinary differential equations. We reveal the structure of
couplings between variables. In particular, we have obtained the decoupled
master equations for zero modes of a vector field. The same analysis can be
done for zero modes of a tensor field. Therefore, our formalism gives a basis
for studying stability of Myers-Perry black holes.
