In 16th bar, MB plays Overtone. This may be played by Low Bb fingering
with Oct Key (1)
2nd voice may be played by same fingering, and pronunced by higher overtone.
If difficult, you'd better open high-D key. (2) : this is my style
In 28th bar, played with alternate finger --MB favorite.
Longer version Karaoke (with theme and ending) is added. (Dec.23-2014)
If you also play the theme part, please try.