  Based on the work of Chen, L\"u and Pope, we derive expressions for the
$D\geq 6$ dimensional metric for Kerr-(A)dS black holes with two independent
rotation parameters and all others set equal to zero: $a_1\neq 0, a_2\neq0,
a_3=a_4=...=0$. The Klein-Gordon equation is then explicitly separated on this
background. For $D\geq 6$ this separation results in a radial equation coupled
to two generalized spheroidal angular equations. We then develop a full
numerical approach that utilizes the Asymptotic Iteration Method (AIM) to find
radial Quasi-Normal Modes (QNMs) of doubly rotating flat Myers-Perry black
holes for slow rotations. We also develop perturbative expansions for the
angular quantum numbers in powers of the rotation parameters up to second
order.

High Energy Physics - Theory;General Relativity and Quantum Cosmology