The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow.

Thus mating of females was strictly along the lines of paternal song.

To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.

Immigration is one of the leading contributors to population growth.

He's written extraordinary songs, hasn't he? I consider him one of the preeminent songwriters of the times. Every song he does has a vitality you don't find everywhere.

By definition pop is extremely catchy, whether you like it or not," Cobain says. "There are some pop songs I hate but I can't get them out of my head. Our songs also have the standard pop format: Verse, chorus, verse, chorus, solo, bad solo. All in all, I think we sound like The Knack and the Bay City Rollers being molested by Black Flag and Black Sabbath.