L'estro armonico National Library of Wales in Aberystwyth. The 1797 Encyclopædia Britannica records that the fifth concerto was also played on an Irish variant of Benjamin Franklin's celebrated invention, the glass harmonica. Under the entry for "Harmonica" or "Armonica", a 35-glass harmonica is described, about which its inventor, the Dublin physician Edward Cullen, writes: There were numerous arrangements for keyboard instruments in the eighteenth century, as described in the next section. One surviving eighteenth century transcription of Op.3, No.3 has been interpreted as an arrangement for glockenspiel. Themes from movements in the concertos were borrowed by other composers for vocal works: the
Social class in 18th-century Spain of the common people continued being very low due to maldistribution of resources. Much of what they could earn was taken in rent, other payments to the landowners, and debt payments (Lynch, p. 5). The worst living conditions for peasants were found in Andalucía, which contained the highest proportion of landless rural labourers ("jornaleros"). Here, the labourers survived only by the work of women and children, by searching for discarded food, and with the aid of charity. Social class in 18th-century Spain The social structure of Spain in the 18th century continued to be based upon nobility and peasantry. However,