Dear boy OST / Дорогой мальчик 1974

Written by David Tukhmanov and performed by ensemble "Vodograi" for the movie "A Dear Boy" (Дорогой мальчик), 1974. The movie itself is funny and cheerful, uses comix insertions, although it's about two boys being kidnapped.
Here is a strong track "Life is a racing" (Жизнь это гонка). I just wonder how masterly the composer has developed that bothered standard rock'n'roll form:
And a psychedelic instrumental:

Full movie, 1119 MB

Дорогой мальчик