The plant of freedom upward sprung,
And spread its leaves so fresh and young-
Its blossoms now are blowing.
On every hand in this fair land,
Proud Ethiope's swarthy children stand
Beside their fairer neighbor;
The forests flee before their stroke,
Their hammers ring, their forges smoke,-
They stir in honest labour.
They tread the fields where honour calls;
Their voices sound through senate halls
In majesty and power.
To right they cling; the hymns they sing
Up to the skies in beauty ring,
And bolder grow each hour.
Be proud, my Race, in mind and soul;
Thy name is writ on Glory's scroll
In characters of fire.
Songs are an expression of how you are feeling. Most  hymns  were about being free, and they echoed into the skies because of others singing along. They gave people the strength to be stronger and bolder. 

Ode To Ethiopia