actually you can know how many there are, officially at least, even wikipedia has a quite reputable list going...
i'm working on a 'world instruments music project' and at this point the best i can tell 'officially' there's between 1,500 and 2,000 instruments - with traditional 'classical instruments' only making up about 300 to 400 of those...
YOU CANNOT POSSIBLE KNOW HOW MANY,THERE IS NO ANSWER.WITH SO MANY DIFFERENT CULTURES, RELIGiONS,TRIBES IT WOULD BE IMPOSSIBLE TO KNOW.A POP BOTTLE COULD BE AN INSTrUMENT TO SOMEONE,.IN Africa ALL THE DIFFERENT DRUMS THAT VARY IN SIZE SHAPE AND TONE.DIFFERENT TYPE OF STRINGED INSTRUMENTS.
I DID NOT ANSWER YOUR QUESTION,BUT I'M SURE YOU GOT THE IDEA.
CAO ROD
Technically speaking any object that makes a noise is an instrument: It can be a rock, keyboard, there is even a piece featuring the typewriter as a solo instrument! Therefore look around you.... everything you see is an instrument! There are over one thousand different types of instruments.
your singing voice or vocal cords.
One can find information about violin lessons in stores that sell musical instruments, in the newspaper classified ads, on the internet at websites from people who offer lessons, such as First Tutors and Long & McQuade Musical Instruments.
There are different kinds of musical instruments used in Annie the musical. You can either Google it, it's faster, or search for the songs used in the musical. And find out what musical instruments used in every song.
I will answer you're question with a question. Where can't you get it?
In most cases you should be able to find those by looking at sites such as www.virtualsheetmusic.com and www.free-scores.com
One can find detailed information about Casio musical instruments from the manufacturer official site. One can also find information from Amazon as it offers Casio musical instruments.
Amazon lists several Selmer musical instruments on its website. Selmer musical instruments can also be available from the Conn-selmer website or the manufacturer.
There are many websites which sell musical instruments. Two websites which have musical instruments for sale are eBay and Amazon. Additionally, an individual may find musical instruments through Guitar Center, Target, and Wal-Mart.
There are a number of musical instruments found in Thailand including the khlui. You can also find the salo and the sueng in Thailand.
One can find more information about musical instruments on Wikipedia where there are details and descriptions of all of them. One can find prices and details for many of them on Amazon.
at the google.com
your singing voice or vocal cords.
Find their number out in the phone book
The common websites that provide goods for sale such as Amazon, eBay and Craigslist will be selling musical instruments. Alternatively, Music123, BestBuy, Musician's Friend and TradingPost are also good websites to purchase musical instruments online.
You can find cellos for sale on the Kijiji website under the "musical instruments" category. To get to this section, visit the Kijiji website and click "musical instruments" under the "buy and sell" section.
The website for legacy instruments is www.legacymusic.com.au I hope this helps, I know it was pretty hard for me to find it... =D
Your local thrift store or your local music store where you can find used musical instruments. You can also try private listings online from classified ads and newspapers.