"My Michigan" (lyrics not yet available) was designated an official state song of Michigan in 1937 ..."in true recognition of the fine thoughts conveyed in the words and music of this lovely memorial to the State of Michigan" and because it "expresses the hopes, ambitions and pride of the people of the State of Michigan."

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.

Source:

Michigan's State Songs: Michigan.gov
Getting to Know Michigan: Michigan.gov
History of Adoption - My Michigan (PDF): MI Historical Ctr.

Links:

Cultural Symbols - 50 states
National Anthem