You know what I'm talking about. Those little bits of interstitial vocal music. Those "Ooh"s, "Ah"s, "La"s that fill in and fill out your favorite songs. The harmonies that make this or that phrase particularly awesome.I was thinking about this tonight as I was calmly driving along listening to the Beatles -- "Love Me Do" to be specific. As I was singing along with the harmonies (yes, it is man...