CLEAN : 'A day of celebration' says Honduras ex-president Zelaya ahead of results

The transcript covers an introduction to some concepts, a discussion on the term 'Terminal', and a reference to Johnny Mathis. It seems to be a casual conversation or a lecture with a mix of topics.

What does the phrase 'But yeah.' suggest about the speaker's agreement or disagreement?

Who is Johnny Mathis, and why might he be mentioned in this context?