Why Barbra Streisand Still Sings

Barbra Streisand will appear tomorrow on CBS Sunday morning. Here's a little preview, as Barbra discusses why she still sings:

“I can buy a painting I like. Or give some work to a university, or do some good...I like singing in a recording studio . . . It’s not performing for anybody . . . I know if I please myself I will please the audience . . . I reach for excellence. I wouldn’t say ‘perfection,’ because there is no such thing.”