You can say, "Oh, I know this song, I've heard this before, this 'rings a bell' but I can't remember who sang this song." What does it mean? Watch here. For more videos - go to www.khmer.voanews.com/maniandmori or www.youtube.com/KhmerSpecialEnglish. To contact Mani & Mori - write to them at firstname.lastname@example.org.