Final answer:
The opening of the song "Eight Days a Week" is considered a first in pop music for its unique style and catchy lyrics.
Step-by-step explanation:
The opening of the song "Eight Days a Week" is considered a unique first in pop music. This song by the Beatles is known for its catchy melody and lyrics that celebrate the joy and excitement of being in love. It was released in 1964 as part of their album "Beatles for Sale."