Guide · Music theory

How to choose a key and tempo

Start with the key that fits the singer, then use a capo or transpose if the instrument needs it: sing the highest and lowest notes of the melody and move the key until both are comfortable. Choose the tempo by the mood of the song and how many words need to fit. Write both down with the recording.

Updated 20 Oct 2026

Choosing a key

1. Find the range of the melody. Sing the highest and lowest notes.
2. Move the key until it sits well. The chorus should reach its high point without strain.
3. Use a capo or transpose if the key is awkward on your instrument. See the key and capo chart.
4. Keep it if it sounds right. A slightly strained key can add urgency, but it is hard to sing every night.

Choosing a tempo

• Match the mood. Slower often feels tender or heavy; faster often feels urgent or joyful.
• Count the words. The faster the tempo, the fewer syllables you can sing clearly. See the syllable counter.
• Try several. Small tempo changes can change the feel. Find your tempo with the tap tempo tool.

Check it against other people

A key that fits you may not fit a co-writer or a band. Agree it early and write it down.

Common questions

How do I find the best key for my voice?

Sing the highest and lowest notes of the melody and shift the key until both are comfortable.

What tempo should my song be?

It depends on the mood and the words. Try a few and see what feels right.

Can I change the key later?

Yes. Record in your own key first if you are unsure.

What is a capo for?

It raises the pitch of every string, so you can play easy shapes in a higher key.

Should I note the tempo?

Yes, so you can set a click or play along later.