Eiffel 65 - I'm Blue
This might be the song you're talking about
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The answer is A focal point. I is <span>the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.</span>
Homophonic texture occurs when there is a melody accompanying with chords like in a guitar. In Baroque period, there was homophonic music as there was one melody with a support from a keyboard player thus one person singing happy birthday with a simple chord with melody has a homophonic texture.