Harp - Vine's Expository Dictionary of New Testament Words
Harp[ A-1,Noun,G2788, kithara ]
whence Eng., guitar," denotes "a lyre" or "harp;" it is described by Josephus as an instrument of ten strings, played by a plectrum (a smaller instrument was played by the hand); it is mentioned in 1 Corinthians 14:7; Revelation 5:8; Revelation 14:2; Revelation 15:2.
[ B-1,Verb,G2789, kitharizo ]
signifies "to play on the harp," 1 Corinthians 14:7; Revelation 14:2. In the Sept., Isaiah 23:16.