Structurally, the only real point of discontinuity in the history of the recorder is the appearance, probably in France, of the so called "baroque recorder". In fact, after only a few years since its first appearance around 1660-1680 it was being copied and made all-over Europe, bringing about the disappearance of all previous models. From the study of many surviving examples, it is very apparent that the design of the baroque recorder is unique. It is almost certain that the huge success of the new instrument meant that manufacturers copied one another within a very short space of time, producing instruments that were very similar if not identical. The differences between the work of one maker and another, like those between instruments from the same hand, are merely in the nature of minor corrections. The most popular baroque recorder is undoubtedly the alto in F, but there are also sopraninos, sopranos, altos in G and tenors in D and C. Finally even bass instruments make a reappearance.