The OP was requesting the lyrics of a song, no answer found yet. But Paderewski absolutely satisfies your criterion, Tattie, not only being established, but world famous as a pianist. He then became one of the main authors of the Treaty of Versailles.

In more recent history, some popular singers ran for presidency in Latin American countries, winning quite considerable electorates. A president of the USA had been a B-movie actor before - certainly a useful training. Good skills in songwriting or musical drama may also help to set the highlights for greatest effect. Of course, being president need not be the same as actually running the country.