Mispitch

It is so easy for over-anxious singers to squeak, to mispitch a note, or to forget the words, that the teacher must display absolute faith in his or her pupils' ability to produce something of value.

Source: wiktionary

My first attempt goes none too well: I sing the wrong mnemonic (though right pitch) in line two and mispitch the leap between lines four and five.

Source: wiktionary

The first two solos on record are probably by Pee Wee Erwin; the third, by Bunny Berigan, starts off strongly, but he appears to mispitch and end up on the wrong harmonic.

Source: wiktionary

Ideally, you purposefully mispitch a low note that is full of harmonics and use a powerful articulation to provoke harmonics to sound.

Source: wiktionary