  We show that the $\mathcal{N}=(1,0)$ superconformal theory on a single M5
brane on the ALE space of type $G=A_n, D_n, E_n$, when compactified on $T^2$,
becomes a class S theory of type $G$ on a sphere with two full punctures and a
simple puncture. We study this relation from various viewpoints. Along the way,
we develop a new method to study the 4d SCFT arising from the $T^2$
compactification of a class of 6d $\mathcal{N}=(1,0)$ theories we call very
Higgsable.
