How do you find do in a key signature?

To find "do" (the tonic) in a major key signature using sharps, you locate the last sharp in the key signature and go up one note. This note will be "do". (0:09-3:14)

Here's a breakdown:

1. Identify the Last Sharp: Look at the key signature and determine which sharp was written last.
2. Locate "ti": This last sharp represents the note "ti" (the leading tone).
3. Find "do": "Do" is one note above "ti".

Example:

If the last sharp is on the top space, that note is "ti". The note one step above on the staff is "do".