Single Letters
vocal and instrumental are kinds of sound in music
Booty
Depending what type of spa would be very important. If it is an Asian inspired spa then you'd likely have instrumental eastern music. The primary consideration is it being relaxing tone and instrumental.
There are various blogs which tell about the music notation software. Sibelius is a company that makes this kind of software. Their website will have information.
The EAR / Yoshino 834T Integrated Amplifier is great for that.
rock, rap, heavy metal, country
No most people now a days will learn what is called as tablature. It also depends on what kind of instrument you play. For instance, piano and other woodwind and brass instruments only come in music notation, while guitar and bass guitar come in both tablature and music notation. Tablature is very easy to read and it's easier to break the song down into single keys or notes using tablature.
Scientific studies have shown that listening to soft, instrumental music can help you to concentrate better - any other kind of music is just distracting.
most commonly, tabs. but in notation it is on a treble clef
Scientific study has proven that only soft, instrumental music helps you to do your work. Music that is loud, has heavy beats or vocals just distracts you worse.
A soundtrack is the music playing during a movie in the background. Some soundtracks are instrumental while others are vocals. Usually there is some kind of wording or statement saying this music is from the movie.
It is, world-wide, the most accepted way of notating conventional western music (both pop/rock and classical music). In contrast to standard methods there are many new, contemporary ways of notating complex music (often a composer creates their own notation system) that may not be possible in standard music notation. Standard notation can give the musician information like: What instrument to play on, what note to play, how long that note is to be played, how soft or loud to play, what kind of playing technique to use, what mood to convey, when not to play, etc. For specifics regarding notation go online and find tutorials on how to read music as this can not be covered in a short post here.