I cannot find broadly documented, reliable public information about a musical artist or band named "Earl Agustin." Based on available widely known sources, there is no well-established record of an artist by that exact name with verified details about country of origin, genre, period of activity, or musical style. If you can provide additional context—such as an alternate spelling, a band affiliation, a region, or a notable recording—I can help produce an encyclopedic description based on verifiable information.