The family firm still manufacture viols, recorders and harpsichords. Bach composed and transcribed concertos for one to four harpsichords. Although not technically pianos, the following are electric harpsichords and clavichords. This construction refers to the early times of modern pianos when they evolved from harpsichords. Some harpsichords may have a lute stop, which simulates the sound of a plucked lute. Renaissance instruments use keyboards similar to Renaissance harpsichords. Keyboard instruments such as harpsichords, clavichords, dulcimers and virginals were played. In England, the Kirkman and Shudi firms produced sophisticated harpsichords of great power and sonority. The Flemish harpsichords were often elaborately painted and decorated, and bore Latin mottoes. Spinets also had smaller soundboards than regular harpsichords, and normally had a weaker sound. They included the first harpsichords with two keyboards, used for transposition. In harpsichords, often there are two sets of strings of equal length. Some early harpsichords used a short octave for the lowest register. Earlier wire, used in harpsichords, was of brass or iron. The song inspired more pop music producers to use harpsichords in their arrangements.