"and the guy thinks he can quicken up the tempo, change some of the lyrics, add an extra bit in!" Hmm, let's plan for what to say next time this happens.

1. Guy: let's quicken up the tempo.
    Allan: Why, are you running out of breath too soon?
    (If he's not singing, say "Why, are your fingertips getting sore?")

2. Guy: I wanna change these lyrics.
    Allan: Yeah, some people are too immature to handle                     sophisticated work.

3. Guy: Let's add this extra bit.
    Allan: A lot of beginners tend to overexplain things.