UK: Boris Johnson MP visits Vaccination Centre at the Business Design Centre in Islington

The speaker discusses dealing with distractions and expresses pride in the effectiveness of a method. They mention initial worries about building up music but acknowledge its success. The speaker notes that many people they know have adopted this approach since a gospel singer popularized it.

What concerns did the speaker have about building up the music?

What does the speaker imply about the people they know and their experiences?