You raise B flat to B, that's a semi-tone, then you raise B to C, another semi-tone. That's two semi-tones equalling one whole tone. If you count it on a keyboard and start with the Bb, it includes three keys, but the intervals are only semi-tones. The convention when counting on a keyboard is to treat the first note as zero, so Bb key is zero, B key is one and C key is 2, again equalling one whole tone.
It sinks in eventually!
Thanks for clearing that up Young Col.
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If you were confused previously, ignore the below! (excluding old gits)
Old git, to be pedantic if there are 2 semi-tones between Bb and C on tenor and 3 on alto then there should be 2.4 on a C mel. Explanation below.
alto in Eb has 3 semi-tones between Bb and C
tenor in Bb has 2 semi-tones between Bb and C
5 semi-tones between tenor (Bb) and alto (Eb), therefore 1 semi-tone difference between Bb and C for every 5 semi-tones difference between instrument keys.
Thus, C melody sax in 'C' between alto and tenor. 2 semi-tones higher than Bb tenor. Therefore 2/5 of a semi-tone. so really it's 2.4 semi-tones between Bb and C on a C melody.
Also working the other way, 3 semi-tones lower than the alto implying 3 - 0.6 = 2.4 QED.
Note: That's why my B is always sharp on the C-mel!
Totally lost now.
Kev, him of the appalling Parker pun, seems to be suggesting that there are three semitones between Bb and C when playing an alto but only two when playing tenor.
This means that if you play a C Melody, logically there are two and a half semitones.
MY BRAIN HURTS!
...
So if you ever get an alto and want to transpose to that follow the same.
1. C
2. Eb
3. minor third higher (3 semi-tones up)
4. minor 3rd lower. i.e C transposes to A
E flatters you, an alto does, while a tenor makes an excellent insect killer (Bee flat...)
Very good :welldone
I hold my hands up and will admit that I knew about the octave differential but decided to omit this vital piece of evidence as I deemed it 'not of great value'
I tried to make my post as easy to understand as possible.
Evidence shows I failed. Guilty as charge your honour.
Young, Oldish Pete,
Drop it an octave and if some notes are too low, up 'em a third, major or minor, a fifth or an octave. It'll probably still be in tune with the alto disc.
Or there a few bits of software you can get where you can transpose the backing tracks themselves and not worry about transposing the notes.
I have used a program called slowgold but I think there are better ones out there. not sure if Audacity or Transcribe! can do this, if they can they're nicer bits of software.