Two angels
The old English 'crowd'
A player on the crwth or crowd (a crowder) from a bas-relief on the under part of the seats of the choir in Worcester cathedral dates from the twelfth or thirteenth century
The Morning Stars singing together
In the MSS. we not unfrequently find the ordinary musical instruments placed in the hands of the angels; e.g., in the early fourteenth-century MS. Royal 2 B. vii., in a representation of the creation, with the morning stars singing together, and all the sons of God shouting for joy, an angelic choir are making melody on the trumpet, violin, cittern, shalm (or psaltery), and harp.
Regal
Of the little portable organ, known as the regal or regals, often tastefully shaped and embellished, some interesting sculptured representations are still extant in the old ecclesiastical edifices of England and Scotland. There is, for instance, in Beverley minster a figure of a man playing on a single regal, or a regal provided with only one set of pipes; and in Melrose abbey the figure of an angel holding in his arms a double regal, the pipes of which are in two sets. The regal generally had keys like those of the organ but smaller. A painting in the national Gallery, by Melozzo da Forli who lived in the fifteenth century, contains a regal which has keys of a peculiar shape, rather resembling the pistons of certain brass instruments. The illustration has been drawn from that painting. To avoid misapprehension, it is necessary to mention that the name regal (or regals, rigols) was also applied to an instrument of percussion with sonorous slabs of wood.