Article: A vocalist's range consists of all the notes between the highest and lowest notes they can sing. Within that overall range, they may have specific areas or keys where they are most comfortable singing. Your vocalist should be able to provide this information to you. If they're unsure, you might have to rely on trial and error to find the best transposition. Find the highest or lowest note, whichever is giving the vocalist difficulty. Adjust the note up or down until it falls within your vocalist's range. Then count the number of steps or half-steps between the original note and the new note. If you have both high and low notes that are outside your vocalist's range, you may have to transpose the song into two different keys to make it work. The key in which the song is played will be transposed just as the notes are. If you are transposing into a particular key, you'll already know what key it's in. If you're just moving up a step or two, you'll need to work it out. If you're unsure about the key, you can use a chromatic circle to find the relation between the keys. These are readily available online. Move counter-clockwise around the circle if you're moving the notes up, and clockwise if you're moving the notes down. For example, if you started in D Major and went up one whole step, your transposed song is in E Major. To transpose the song, you must move each note up the same interval. If the song has other sharps and flats not related to the original key signature, ignore it for now but mark where it is. Transpose a note with an accidental sharp or flat from where it normally would be in the original key. For example, assume the B note is natural in the original key. If the song has an accidental B-flat, you would move the note from B not from B-flat. Once you've transposed the entire song, go back to the original score and look for any sharps or flats. Work out how far up or down the original accidental moved the note, and then adjust it that number of steps in your transposed song. For example, assume the B note is natural in the original key. If the song has an accidental B-sharp, that means the natural B was moved up a half-step. Find that note in your transposed song and move the transposed note up a half-step as well, marking the new accidental. After you've completed your transposition, it's a good idea to play through the song and check to make sure you've moved the notes correctly. Your vocalist also may want to try the song out and see if it's now more comfortable for them to sing.

What is a summary?
Identify the vocalist's range. Find your interval. Write your new key signature. Move the notes into the new key. Adjust the accidentals. Play the transposed song.