* C major: This key has a bright, cheerful sound that can still be calming. It is one of the most commonly used keys in music, and it works well for lullabies that are meant to be uplifting.
* G major: Another bright and cheerful key, G major has a slightly warm, mellow quality to it. It is also commonly used in lullabies, as it is easy to sing and play on many instruments.
* F major: F major has a gentle and soothing sound. It is a good choice for lullabies that are meant to be relaxing and peaceful.
* D major: D major is a calming and serene key. It is often used in lullabies that are meant to evoke feelings of nostalgia or gentleness.
* E major: E major has a light and airy feel, making it a good option for lullabies that are meant to be uplifting or hopeful.
Of course, there are other keys that can also be used for lullabies. Ultimately, the best key for a particular lullaby will depend on the desired mood and emotion of the song.