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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>

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Musical Instruments: History, Technology, and Performance of Instruments of ...
By Professor of Musical Acoustics Murray Campbell, Murray Campbell, Clive A. Greated, Arnold Myers, Senior Lecturer in Music and Director Arnold Myers
T because i really think its the answer i am not really sure but im going for it....
Answer: C. Take My Hand, Precious Lord (Precious Lord, Take My Hand)
Explanation: Dorsey wrote the lyrics of the song and also adapted the original melody. The first known recording of Take My Hand, Precious Lord was on February 16, 1937, by the Heavenly Gospel Singers.
