There's Bach's concerto for two harpsichords and orchestra in d minor. That's baroque. There's also Poulenc's concerto for two pianos and orchestra in d minor. That's romantic. Technically, the answer to your question is no.
According to the 'source' linked below, "The concerto No. 10, for four violins and string orchestra (RV 580), became a concerto for four harpsichords and string orchestra (BWV 1065)" There's more information there as well. http://scores.ccarh.org/vivaldi/op3dawsonnew/dawson_complete.pdf You can check them out on Youtube pretty quickly...But the ones for 4 harpsichords aren't the greatest...There's an awesome one on the Air & Badinerie CD that Deutsche Grammophone (sp?) put out.
Pianos, and harpsichords are both stringed instruments. When a key is pressed on a piano, a hammer hits one of they many strings hidden in the body. In contrast, harpsichords are plucked when keys are pressed.
Pianos, rather than harpsichords, are touch-sensitive because they strike the string while harsichords pluck it.
Harpsichords and pianos are completely different, the piano using hammers on the strings whereas the harpsichord is plucked by "quills". Harpsichords are shaped like a grand piano, but narrower and longer. There are also spinets and clavichords which are like small harpsichords.
it depends on the orchestra
There are usually no mandolins in an orchestra.
Usually there are no baritones in an orchestra.
Harpsichords were very popular in the 16th century, but once the piano was later invented, the harpsichord was somewhat replaced. Harpsichords are still used today.
London Symphony Orchestra Philharmonia Orchestra Royal Philharmonic Orchestra The Halle Orchestra and maybe many others
There are about three to four trumpet players in an orchestra.
In a typical orchestra, zero. None.