Band Together is the first half of episode 19.
Plot
Granny listens to some music on the radio and the babies decide to make some like it. Lola has this fantasy of them all in a band. Later they (except for Daffy) try to make a band. They're terrible, but Granny likes it. (well, that's what she tells them)
Trivia
The song Granny listens to was referred to as classical music in a summary but it isn't; it refers to movie score.
During Lola's Dream Ballet, music from Peter Tchaikovsky's Swan Lake Suite plays.
During one point when Tweety tries the flute, the sound was actually a piccolo (this is an octave higher than a normal flute).
Starting with this episode, the babies don't wear diapers anymore. They now grow up a bit.