Possibly sung to the tune of "O Tannebaum", a/k/a "Maryland My Maryland":

Michigan, My Michigan
Written by: William Otto Miessner & Douglas M. Malloch

A song to thee, fair State of mine,
Michigan, my Michigan;
But greater song than this is thine,
Michigan, my Michigan;
The whisper of the forest tree,
The thunder of the inland sea;
Unite in one grand symphony
Of Michigan, my Michigan.

I sing a State of all the best,
Michigan, my Michigan;
I sing a State with riches blest,
Michigan, my Michigan;
Thy mines unmask a hidden store,
But richer thy historic lore,
More great the love thy builders bore,
Oh, Michigan, my Michigan.

How fair the bosom of thy lakes,
Michigan, my Michigan;
What melody each river makes;
Michigan, my Michigan;
As to thy lakes the rivers tend,
Thy exiled children to thee send
Devotion that shall never end,
Oh, Michigan, my Michigan.

Thou rich in wealth makes a State,
Michigan, my Michigan;
Thou great in things that make us great,
Michigan, my Michigan;
Out loyal voices sound thy claim
Upon the golden roll of fame
Our loyal hands shall write the name
Of Michigan, my Michigan.