If you want to learn how to sing like The Roots featuring Common and Ingrid Michaelson, there are several things you can do to master their unique vocal style. The Roots are known for their fusion of hip-hop and jazz, while Common adds a mellow flavor and Ingrid Michaelson brings a pop influence to their sound. Here are some tips to help you learn how to sing like The Roots featuring Common and Ingrid Michaelson:

1. Start by analyzing your voice using Singing Carrots’ article, How to analyze your voice.
2. Learn about your voice type using Singing Carrots’ article, Voice types.
3. Practice your breathing with Singing Carrots’ article, Breathing basics and Breath support.
4. Master your vocal registers by following Singing Carrots’ article, Voice registers & vocal break.
5. The Roots incorporate a lot of rap and hip-hop styles in their music. Practice these styles by learning more about them in Singing Carrots’ article, Pop/Jazz vs Classical singing, which covers the differences between popular singing and classical singing styles.
6. Focus on your articulation by reading Singing Carrots’ article, Articulation.
7. Practice singing in a lower, mellower voice by exploring your chest voice and learning how to relax your vocal cords while singing.
8. Familiarise yourself with The Roots' style by listening to their music and analyzing their vocal techniques. Songs like "You Got Me" and "The Next Movement", featuring Common, showcase their signature style.
9. Ingrid Michaelson brings a pop influence to some of The Roots' tracks, like "I Remember" and "Lighthouse". To learn how to sing like her, focus on your pitch accuracy with Singing Carrots’ Pitch accuracy test and Pitch Training.
10. Finally, record yourself singing and compare it with the songs you are trying to emulate. This will help you identify areas you need to work on.

Remember to take care of your voice by reading Singing Carrots’ article on Vocal health, and continue to practice regularly. With time and effort, you can learn to sing like The Roots featuring Common and Ingrid Michaelson, and develop your own unique artistic style. Good luck!