Castrucci
It’s great acquainting yourself with composers who are unfamiliar to you and I was getting to know Pietro Castrucci when I read that he had invented something called the violetta marina. There was no explanation of what that was, but since “violetta” refers to a small violin, it appeared to be some type of string instrument.
Of course, the first thing I did was search the term on Google and there was little about it. But I did come across a discussion on the topic among violin makers, and one mentioned that he believed Handel used one in Orlando
Handel’s Olando
The consensus among the violin makers was that the instrument was a type of viola with sympathetic strings, what’s called a viola d’amore. Sympathetic strings (sometimes also referred to as resonating strings), are strings that sit below the regular strings and vibrate, or resonate, in sympathy with the strings above them as they’re played. (Click on the violin image below.) A few Baroque composers, including Franz Biber and Attilio Ariosti, make fairly extensive use of instruments with sympathetic strings. Vivaldi also uses them in some of his compositions. I especially like Biber’s use of them in Harmonia Artificiosa. A good example is his Partia VII. Listen to the first 30 seconds and you’ll hear the resonating strings. (Click on the video at the end of this post.)
Sympathetic strings.
Click to enlarge.
And yet the mystery persists, because even violin makers can’t say with any certainty how the violetta marina differs from the viola d’amore. “I don’t think that any such instrument has been found,” says Myron Rosenblum, one of the participants in the violin makers’ discussion.
The Viola da Gamba Society of America thinks it’s a small, three-stringed viola with a sympathetic string.
Castrucci is a fairly obscure composer. I can find only one full album of his music on Amazon, his 6 Concerti Grossi, Op. 3. 
He’s featured on some compilations with other Italian composers, but little of his work appears to be around today. Even the International Music Score Library Project (IMSLP), which is so thorough in cataloguing sheet music, has no Castrucci compositions in its databases. On YouTube there are performances of some sonatas featuring recorder solos (see the image below for Sonata No. 3), but other than those, plus the Concerti Grosso, there isn’t much.
Castrucci Sonata No. 3 for Recorder
We do know Castrucci studied with Corelli for a while and later was the leader of the opera orchestra of George Frideric Handel, so he would be familiar with Handel’s use of the viola d’amore in Orlando.
Ideally, we would go to that opera to hear what the violetta marina sounds like, since the piece calls for it, but contemporary recordings use the viola d’amore.
For a while I wondered if the instrument is in some way related, or developed in tribute, to French composer Marin Marais, who was noted for his basse de viol work. Indeed, he is probably the leading historical composer of that instrument. Given that Castrucci named his instument violetta marina, it makes you wonder if he wasn’t trying to produce an instrument with a sound that resonated with Marais’s work.
Tromba Marina
But then I came across a reference to the tromba marina in a book called Instruments in the History of Western Music
Whether there’s any connection between these two marinas, the tromba and the violetta, is unclear. Given that, and as long as even violin makers don’t know what the violetta marina is, the idea that it’s an instrument that tries to channel Marin Marais is probably as good a theory as any.
In any case, the viola d a’more produces a wonderful sound. I especially like it in Biber’s work. It would be great to eventually get to the bottom of the mystery of the violetta marina, because I’m sure many people would like to hear what works written for viola d’amore sound like using Castrucci’s invention.—Nabob, On Baroque
Franz Biber’s Partia VII:
On Baroque 
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