Here is the phrase:
"Your choir’s vocal harmony is top notch; now, the time has come for some visual harmony. "
Here is the phrase:
"Your choir’s vocal harmony is top notch; now, the time has come for some visual harmony. "
It is entirely acceptable to use a semi-colon to indicate a close relationship between sentences.
In this instance, you could certainly use a period in place of the semi-colon, but the choice of using a semi-colon is a good one: it makes the contrast between the two statements more powerful and surprising by emphasizing the connection of 'harmony'. Bravo.