Jonas Blue is a UK-based DJ, producer, and songwriter. He has remixed and produced songs for famous artists like Ellie Goulding and Zayn Malik, and has also released original tracks of his own. One of his most popular songs is "Rise," featuring American pop group Why Don't We.

If you want to learn how to sing like Jonas Blue and hit high notes like the members of Why Don't We, here are some tips and resources to help you:

1. Start with vocal warm-ups and breathing exercises to prepare your voice. Check out Singing Carrots' breathing basics and Farinelli breathing video warm-up.
2. To learn how to hit high notes like Jonah Blue and Why Don't We, it’s important to understand voice registers & vocal break and breath support. Singing Carrots’ Comfort Zone and Mixed Voice videos can help you master it.
3. Practice singing with an open mouth and throat to improve your tone. Learn more about this in the article Why to open mouth and throat while singing.
4. When practicing, take the time to analyze your voice to identify areas where you need to improve, use Step 1 of Singing Carrots' Pitch Monitor to visualize your singing.
5. Sing along with why Don't We hits like "I Still Do," "Fallin'," or "What Am I". it can enhance pitch accuracy and Vocal Pitch Monitor` can show you exactly what pitch you are singing.
6. Check out Singing Carrots' songbook and use the search engine to find songs that match your vocal range, difficulty, and genre preference.
7. Finally, take Singing Carrots' singing course. You can start the 21-lesson program covering singing theory and practical tips, and on the friendly forum, you can post your progress statistics and get personalized feedback from Singing Carrots' community.

By following these tips and utilizing these resources, you can learn to sing like Jonas Blue and Why Don't We and achieve your singing goals. Good luck and keep practicing!