Rubber Bands– in case your ligature bends or breaks. This is especially the case in a crazy band room where you might accidentally drop your ligature and someone steps on it. :(
Four Working Reeds in a Reed case!!! Here is a link to the new Vandoren reed cases as sold through Weinermusic. They are quite nice!
Cork Grease– for tenon corks so that you may assemble clarinet easier
Thumb Rest Pad A.K.A. “Thumbie”- to ease pressure on right thumb
Silk Swab–Silk will not expand like cotton. If you are still using that polyester rectangle that came with your clarinet “cleaning pack,” it’s time to toss that.
For mouthpiece– wipe with swab separately. Just use the cloth portion. You want to avoid dragging the string or the weight attached to the string through the mouthpiece.
Mouthpiece patches allow you to have a firm grip on your mouthpiece. When your upper teeth sit on the mouthpiece without a mouthpiece patch, you’ll notice that the mouthpiece wiggles around in your mouth. This keeps the teeth in place.
For A Wooden Horn:
Oil– depending on climate and on how new the horn is. There are lots of arguments about oiling a wooden horn. I am for it. Once you start oiling it though, you can’t stop. Here in El Paso, I oil my clarinet about every 3-4 weeks. My clarinet is about a year and a half old. Once I start to see the wood grain inside of the instrument then I add a little oil. There are bore oilers but they leave a lot of fuzz inside your horn. It is better to do it with a cloth wrapped around a pencil or even a plastic flute tuning rod. Don’t put too much on. It shouldn’t drip from the sections but just thinly coat the inside of the parts (except for the mouthpiece because they are made of hard rubber).
Humidifiers– to keep horn from drying. The humidifiers just go in the case not through the joints! The inside of your instrument remains humid from the last time you played, as long as you play everyday :D.
METRONOME/TUNER–Several music stores have these as a combo now.
Clarinet Stand. This is for the clarinet itself. Some clarinet stands are a little too bulky for the clarinet case but you can always tie a make-up bag to your case and put the stand in there. Some stands are more compact and will fit in the case, however, I find these to be less reliable. My recommendation is the K&M Clarinet Stand. Here’s a link to this fabulous thing! K&M Clarinet Stand