What does that mean?

On Thursday we did a review of the songs we will sing at the second concert. We also discussed what's going to happen. 
 The singers will arrive at Casa Central ay 10 AM. We'll hang out and practice and eat lunch until it's time to leave. That's when we change into tour uniforms and go to where the concert takes place. And I think you can guess what happens next. 

CONCERT INFORMATION

TIME- 4PM TO 5PM

PLACE- NAZARETH FAMILY CENTER, 1127 NORTH OAKLEY BOULEVARD

SNEEK PEEK DETAIL: THE NEWBIES (THAT INCLUDES ME!!!) WILL SING "DONA NOBIS PACEM" AND THEN A SENIOR VIVACE WILL GIVE THEM THEIR OFFICIAL CONCERT VESTS, MAKING THEM OFFICIALLY A PART OF THE CCC! AWESOME!!!!!

Anywaaaaaaaay, I  sang the solo for Mr. Wallenburg and he smiled and said "Great! Keep working on it!"

What does that even mean? I don't get it.......