what does "expressively ( [quarter note]= ca. 60) mean in music?

Question

on my piece of music i am singing in chorus, thatg is at the top of the first system, i was wondering what it meant

Answer 1

That's a metronome marking, it indicates pace. This one is sixty beats per minute, every quarter-note gets a beat. These showed up around Beethoven's time (although he didn't use them)