Context: The reasons for the strong Swedish dominance are as explained by Richard Sparks manifold; suffice to say here that there is a long-standing tradition, an unsusually large proportion of the populations (5% is often cited) regularly sing in choirs, the Swedish choral director Eric Ericson had an enormous impact on a cappella choral development not only in Sweden but around the world, and finally there are a large number of very popular primary and secondary schools (music schools) with high admission standards based on auditions that combine a rigid academic regimen with high level choral singing on every school day, a system that started with Adolf Fredrik's Music School in Stockholm in 1939 but has spread over the country.

Question: What is the name of the Swedish man known for being a large influence to a cappella across the world?
Answer: Eric Ericson

Question: Which music school began the implementation of high musical standards?
Answer: Adolf Fredrik's Music School

Question: What portion of the Swedish population engages in a cappella singing?
Answer: 5%

Question: Who describes the many reasons for Sweden's heavy involvement in a cappella?
Answer: Richard Sparks

Question: What does Eric Erickson explain about Swedish dominance in choirs?
Answer: Unanswerable

Question: What did Richard Sparks influence in Sweden and world wide?
Answer: Unanswerable

Question: What has high admission standards based on tradition?
Answer: Unanswerable

Question: What a cappella group began implementing high music standards?
Answer: Unanswerable

Question: What percentage of the world takes part in a cappella singing?
Answer: Unanswerable