Being and oboist and a singer, I can confirm that the breathing techniques re subtlely different.
I counldn't give a better description of full intercostal breathing and support than Ann C had given. She has described it to a T, and it is the correct form of breathing for a singer.
QUOTE
) Intercostal breathing - this is what you are aiming for! -
For singing purposes - take a breath in always through the mouth - this sorts out the position of the soft palate - like a happy surprise. This opens the throat, which, during singing, should be shaped like the BEGINNING of a yawn. The breath is aimed down into the back, where you have the largest lung capacity. If you put your fingers and thumbs on your bottom ribs, you should feel them being pushed outwards.
An exercise to increase lung capacity (by encouraging the back muscles to become more flexible) is to sit upright on a dining room chait with rails on the back. Take a breath in as described above, then, without breathing out, close your lips and continue to sniff in through the nose until you can get no more air in. (I learnt that one at the RCM conference for singing teachers as well!) Breathing has to be swift because you don't have much time during songs. Often you can only take a top up breath, but always aim it down into your back for maximum efficiency in the time.
Support consists of keeping the rib cage high - i.e. where you find it after taking the breath and thinking of pushing the air against your chest wall, or imagining having a belt around your bottom ribs and pushing out against it to stop it falling down, This stops the ribs acting like bellows and forcing the air out too soon, wich leads to a breathy tone. For attack on a higher note, or at the ends of phrases, tuck in with the upper abdominal muscles as well to give the diaphragm a helping hand.
Hope this helps. It's not something that is grasped quickly without guidance - rather like learning to change gear!
As singing teachers this is the science bit, but it is not always the clearest way of describing it to singers. An experienced teacher develops a number of metaphors to put this into practice. this is wher phrases like
"breath into the bottom of your lungs" "feel you ribs open up like a hinge." all fit in. This (without putting words into Ann'smouth) is what is meant by guidance, and why it is so important to have singing lessons from some one who understands the mechanic of breathing.