Painting by C. Bega

"Wÿ singen vast wat nieus, en hebben noch een buÿt, Een kraekling, is ons winst, maet tliedtkenmoet eerst wt." I have a small oil painting on oak panel which bears the above inscription. The subject of the painting is a boy, who holds in his hands a song, which he appears to be committing to memory, whilst another boy is looking at the song over his shoulder. "C. Bega" is written on the back of the picture-frame, that evidently being the artist's name. I shall feel obliged by your translating the above two lines for me, and also for information as to "C. Bega."