Here’s a tip for pop singers: if you’re going to post advice online about how to sing well, you’d better hope it isn’t discovered by classically-trained singers.

A recent video masterclass by multi award-winning artist Christina Aguilera fell foul of classical critics this weekend, with dozens of trained singers taking to Facebook to find fault with her vocal technique and teaching style.

Despite Aguilera’s real and much-publicised ability to hit the high notes in performance, Facebook users were quick to point out that the highest note demonstrated in her tutorial isn’t actually very high at all.

Less than an octave above middle C, B4 can be sung easily by most women – and some men, too. It’s just one semitone higher, for example, than the highest note in the tune of ‘Hey Jude’, and more than an octave and a half lower than the famous high F sung by Mozart’s Queen of the Night in The Magic Flute.

Aguilera posted the video – entitled ‘The Secret to Hitting High Notes’ – to her Facebook page last week as a teaser for the launch of a forthcoming vocal series on Masterclass.com.

Unfortunately, she may as well have published a masterclass on ‘How NOT to advertise yourself as a singing tutor… to singing tutors’.

Ouch! But other classically-trained Facebookers came to Aguilera’s defence.

The Christina Aguilera Teaches Singing series will be released this spring on Masterclass.com for a pre-order price of $90: watch the trailer here.

But before you part with any funds, we recommend that you check out a video produced by our incredibly talented Amphio colleague, Greg – himself the owner of an incredible vocal range.

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What do you think – do the Facebook haters have a point, or are they just being mean? And is it even fair to compare pop and classical singing techniques?