Hi,
I do and I don't recommend these.
As a director who has worked with many actors and actresses over the years, there are some good and bad points here.
In general, almost ANY professional should/could/would be helpful and always able to sa, or do something that helps you get better. The only ones that don't are the ones that have fame all over their nose and they don't like you because you don't pay enough!And you don't have enough girls around you to show how good you are!
The hard part, is that just about ANYONE can teach you some basics, like breathing ... or one can tell you jokes about Maria Callas! But these can be easy to do, if the material suits you and your voice, but really tough if the material doesn't jive with you. Somethings are always better than others in this department.
From a scholastic department, like a Berklee, or equivalent, they can only give you some ... basics ... as they do not have the time, the ability or the people to teach you more advanced stuff ... however, the best part of it is ... that the advanced stuff has a lot more to do ... the words themselves ... than they do anything that I can possibly teach you.
Here are some examples: ... you can not teach Bob Dylan about subtle sarcasm ... check out how he says it ... that's not "teach'able" as that is the person he is! Plain and simple ... so, this becomes ... a person that learned how to use his voice and his feelings, with some music ... to make a point ... she knows what she needs, I know what she wants ... and it's not mean, but it droops with ... not nice! ... and that is not exactly "singing" as much as it is "expression".
In the end, the "best" singing, is much more about "expression" than it is about the mechanics ... however, you have a say in the strength and depth of your mechanics ... like did you know that your voice carries at 5AM in the cooler air, than it does at 5PM in warmer air? ... now you know why Greek Theater always started early! ... but it has also been a massive vocal exercise that you can use to help open up your throat to allow for more air passage, and prevent you from running out of breath ... every sentence ... which, btw ... is the worst thing that singers do ... not knowing WHEN to breathe so they are not out of breath!
To me, from a director's point of view, I'm going to work you with the material until you "live" it ... and you are no longer quoting a script or words ... on a stage!!! ... you are doing something else.
Now, I KNOW this works, and I have done it with musicians and their music ... and singing, is no different than "acting", but if you really want to learn about singing and expression, one of these days go listen to Peter Hammill or a Roy Harper, the two pure'st poets out there in music, and what they do with their words. Roy is more total adlib ... and sometimes difficult to follow ... Peter is more logical and controlled, but his emotions go from here to heck and back!
I'm not convinced that you can teach "singing", any more than you can teach Bapu to play his "Bass" or Grant can learn to play his "Guitar" or ... Karyn can play her "Cowbell" ... in the end, it is more about "feeling it" than it is ... just play that riff ... well, there are a lot of musicians making money off that one riff, but that's another story ... and you know it!
There used to be, in theater, something ... very difficult to teach ... and it is ... "you got to feel it" ... and you DO have to feel it, and if you do, the rest is not important and you will do it right everytime ... no one will question it ... but to get to that point, is often less of an experiment, than it is an inner flow and feeling ... and if you can define that, it gets easier.
This is teach'able. But getting you to be able to understand the suggestions and the details and the methodology to get to learn stuff that well? ... you would be just like a lot of graduate students out there playing an instrument ... they might have learned to be pitch perfect and relative pitch very good ... but they have no feeling whatsoever behind it ... because it is all mechanics, not feeling! IN my book, those folks need to get stoned and are in need of some serious psychedelics ... but that's a bit old school nowadays and tough to explain to most folks here!