Using the provided dictionary entry, which word could be used to describe two people singing together?
a. tam-tam: same as tom-tom.
b. tan: noun, the bark of the oak or other trees bruised and broken by a mill for tanning hides; adjective, tan-colored; verb, tanned, to convert a hide into leather by steeping it in an infusion of bark or tannin; make brown by exposure to the sun; beat; to become sunburnt.
c. tandem: adverb, with two horses or persons one before the other; a bicycle or tricycle for two, one riding before the other.
d. tang: noun, a strong taste or flavor; something that leaves behind a taste peculiar to itself; that part of a knife, fork, tool, etc, which is inserted into the handle; sound or tone; verb, to make a ringing sound.
e. tangency: noun, a contact or touching.
f. tangent: adjective, touching; noun, a straight line that meets or touches a circle or curve, but when produced, does not cut it public domain tan tandem tang tangent