Sorry if this is only for flutes, but I heard that flutes and piccolos are somewhat similar and I couldn't find a piccolo forum. I started playing the piccolo about two weeks ago, and it's going pretty well, I can already play everything in the Flute book that I got at the store where I rented my piccolo (they didn't have any piccolo books ). Anyway, I'm having trouble hitting the D natural on the fourth line, and the E flat on the fourth space, even though I can hit all the notes around them easily. Also, sometimes my lower notes are airy. One last question is that I hope to be ready to play the piccolo in my band but I've never actually seen piccolo music, or flute music for that matter (I play the clarinet, not recommended I know, the guy at the music store told me) and I was wondering if anyone knew where I could find some, just to know what to expect if I manage to get to that level by the fall.
Also, you mentioned playing clainet, but didn't mention if you have been playing the flute. The piccolo embouchure requires a much smaller opening in the lips when compared to the flute. If you have not been playing flute, the piccolo can be difficult to learn. Unlike the clarinet, the flute and piccolo do not have a register key. Higher notes require the player to use a faster (not harder!) air stream and you must direct the air stream a bit higher.
"Never give a flute player a screwdriver."
--anonymous--
I'm using the correct fingering. It can sometimes kind of come out, but not as strongly as my other notes, and sometimes it won't come out at all. And, I don't play the flute.
I would strongly recommend that you take private lessons to help to get started. In the meanwhile, practice lip slurs to help develop the proper embouchure. Play a low D (or Eb) at the bottom of the staff. Then without changing the fingering, move the air faster and direct the air stream slightly higher. When you do this correctly, it should jump to the D (or Eb) an octave higher. You can also practice this on the other notes in the lowest octave. Just practice going back and forth from the lower to the higher note.
"Never give a flute player a screwdriver."
--anonymous--
A lip slur is playing a different note with the same fingering as I described in my previous message. Finger a lower note, play it and make it jump to the same note an octave higher. With practice, you should be able to jump an octave, then continue on to an octave plus a fifth, and then two octaves higher. i.e. low D, middle D (4th line), A above the staff, and then D above the staff. This uses the overtone series just like brass players.
"Never give a flute player a screwdriver."
--anonymous--
It could also be a technical issue. If you tried the exercise that pied piper recommended and haven't made any progress, I would have someone take a look at it. Maybe the pads have a leak.
If it is a mechanical problem there is no way for you to fix it, you would have to take it in to get fixed. I have that kind of problem with my old piccolo, ever note is fine except for my middle f and g. But on my new one they are fine, one of my flute instructors told me that I had a cracked pad. I looked but couldn't see it. It could be as simple as that. I wish you luck.
Perhaps it's a pad problem, as everybody's saying. Air leaks on a piccolo are a huge problem (as are air blockages from the clogging tone holes too). Also check that the end of the piccolo isn't clogged, particularly the Eb key.
Another possible problem is that you aren't focusing your airstream properly. A relaxed embouchure does not mean an unfocused one, so you might want to play around with the embouchure to find a good tone.
If that doesn't work, I suppose you can blame the piccolo; send it for a checkup.
The flute family: probing the lower limit of human hearing and the upper limit of human tolerance.
). Anyway, I'm having trouble hitting the D natural on the fourth line, and the E flat on the fourth space, even though I can hit all the notes around them easily. Also, sometimes my lower notes are airy. One last question is that I hope to be ready to play the piccolo in my band but I've never actually seen piccolo music, or flute music for that matter (I play the clarinet, not recommended I know, the guy at the music store told me) and I was wondering if anyone knew where I could find some, just to know what to expect if I manage to get to that level by the fall. 
