The Igglybuff line sings. The Whismur line is based on volume. The Chingling line is based on wind chimes. The Kricketot line might be based on harps. Chatot is based on a talking parrot with a music note as its crest. Maractus is based on maracas. Meloetta is based on a performer. Primarina is based on a mermaid (Think of Ariel from the Little Meraid's voice loss).