John Rzeznik is an American musician and the lead vocalist of the Goo Goo Dolls. He has a unique vocal technique that blends richness and emotion. His hits include "Iris", "Broadway," and "Slide."

To learn to sing like John Rzeznik, follow these practical tips, and Singing Carrots resources:

1. Breathing technique: John Rzeznik has amazing control over his breath. To achieve that, do breathing exercises like the Farinelli Breathing.
2. Warm-up: Start warming-up by humming like John. Also, do the 3 Minute Warm Up.
3. Voice Registers: John Rzeznik uses the chest voice/belt register. Learn how to master the chest voice by singing inside your comfort zone, like this singing tip, Chest Voice Explained.
4. Pitch accuracy: To work on pitch, practice singing the scales. Start by using the Pitch accuracy test.
5. Open Mouth & Throat: Open your mouth and throat to achieve a rich sound like John Rzeznik. Learn how to it here.
6. Vocal range: After getting your vocal range test, find songs that match your vocal range, difficulty, and genre preference.
7. Song preparation: To prepare a song, check out How to learn a song effectively.
8. Vibrato: Vibrato is the slight variation of pitch. John Rzeznik uses it to make his songs even more emotive. Check out this exercise.
9. Articulation: Proper articulation is crucial in singing. Practice with Finger Bite to achieve better diction.
10. Performance skills: John Rzeznik sings with emotion, skills, intuition, and thinking. Find out how to improve your singing through these factors.

By following these tips and Singing Carrots resources, you can learn how to sing like John Rzeznik. Good luck!