Wise as the serpent is the four feet of performer on
    the nearest approach to that instrument.

This was written when the serpent was practically extinct, but Dickens would be very familiar with the name of the instrument, and may have seen and heard it in churches in his younger days.

In referring to another boy’s attempt at solving the arithmetical puzzles, he mentions the cymbals, combined with a faint memory of St. Paul.

    I observe the player of the cymbals to dash at a
    sounding answer now and then rather than not cut in at
    all; but I take that to be in the way of his instrument.

In Great Expectations Mr. Wopsle, who is a parish clerk by profession, had an ambition not only to tread the boards, but to start off as Hamlet.  His appearance was not a success, and the audience was derisive.

On his taking the recorders—­very like a little black flute that had just been played in the orchestra and handed out at the door—­he was called upon unanimously for ‘Rule Britannia.’

Reference has already been made to Bucket’s music-shop, so we must not forget to visit Caleb Plummer’s little room, where there were

    scores of melancholy little carts which, when the
    wheels went round, performed most doleful music.  Many
    small fiddles, drums, and other instruments of torture.

The old man made a rude kind of harp specially for his poor blind daughter, and on which Dot used to play when she visited the toy-maker’s.  Caleb’s musical contribution would be ’a Bacchanalian song, something about a sparkling bowl,’ which much annoyed his grumpy employer.

    ‘What! you’re singing, are you?’ said Tackleton, putting
    his head in at the door.  ‘Go it, I can’t sing.’

    Nobody would have suspected him of it.  He hadn’t what
    is generally termed a singing face, by any means.

The wonderful duet between the cricket and the kettle at the commencement of The Cricket on the Hearth certainly deserves mention, though it is rather difficult to know whether to class the performers as instrumentalists or singers.  The kettle began it with a series of short vocal snorts, which at first it checked in the bud, but finally it burst into a stream of song, ’while the lid performed a sort of jig, and clattered like a deaf and dumb cymbal that had never known the use of its twin brother.’  Then the cricket came in with its chirp, chirp, chirp, and at it they went in fierce rivalry until ’the kettle, being dead beat, boiled over, and was taken off the fire.’

Dickens was certainly partial to the cricket, for elsewhere (M.H.C.) we read of the clock that

    makes cheerful music, like one of those chirping
    insects who delight in the warm hearth.

There are two or three references to the key bugle, which also used to be known as the Kent bugle.  It was a popular instrument half a century ago, as the addition of keys gave it a much greater range of notes than the ordinary bugle possessed.  A notable though inefficient performer was the driver who took Martin Chuzzlewit up to London.