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Spectral measures for fundamental representations of the rank two Lie groups$SU(3)$, $Sp(2)$ and $G_2$ have been studied. Since these groups have rank two,these spectral measures can be defined as measures over their maximal torus$\mathbb{T}^2$ and are invariant under an action of the corresponding Weylgroup, which is a subgroup of $GL(2,\mathbb{Z})$. Here we consider spectralmeasures invariant under an action of the other finite subgroups of$GL(2,\mathbb{Z})$. These spectral measures are all associated with fundamentalrepresentations of other rank two Lie groups, namely $\mathbb{T}^2=U(1) \timesU(1)$, $U(1) \times SU(2)$, $U(2)$, $SU(2) \times SU(2)$, $SO(4)$ and $PSU(3)$.

Spectral measures associated to rank two Lie groups and finite subgroups of $GL(2,\mathbb{Z})$