David Guetta is a French music producer and DJ known for his electronic dance music style. Justin Bieber is a Canadian singer and songwriter whose pop and R&B songs have topped charts around the world. Together, they collaborated on the popular song "2U" which showcases their unique vocal abilities with catchy beats.

If you want to learn to sing like Justin Bieber, there are some techniques you need to focus on. First of all, Justin Bieber has a unique tone that is mostly attributed to his use of falsetto. In order to hit high notes like he does, you need to practice using your falsetto voice. When singing falsetto, the vocal cords are only partially engaged, resulting in a lighter sound. To build up your falsetto, try starting with a comfortable note and singing up the scale, increasing your range as you go.

In addition to using falsetto, Justin Bieber is known for his use of vibrato. This vocal technique adds a slight waver to your voice, giving it a fuller and more expressive sound. To practice vibrato, try singing a note and gently shaking it up and down. You can also practice this technique with the Singing Carrots vocal exercises, such as the "Beggar's Bounce" video.

Another technique used throughout Justin Bieber's songs is the use of riffing. Riffs are quick runs of notes that give a singer the ability to add their own personal flair to a song. The ability to riff is often referred to as "vocal agility". To practice your riffing skills, start by singing a simple pattern of notes, such as a scale, then try adding extra notes in between.

When singing "2U", you should also focus on your breath support. Breath support is crucial when trying to hit high notes and maintain a strong and consistent sound throughout the duration of a song. Singing Carrots has plenty of resources to help you with your breath support, such as the "Farinelli Breathing" video.

Finally, when it comes to performing a song like "2U", you need to pay attention to your stage presence and emotion. Justin Bieber is known for his captivating performances, and his ability to connect with his audience. To establish a stronger connection with your listeners, try to be more expressive with your facial expressions, hand gestures, and body language while performing.

To sum up, if you want to learn to sing like Justin Bieber in "2U", focus on using falsetto, developing vibrato and riffing skills, working on breath support, and practice expressing emotions while performing. Don't forget to check the Singing Carrots resources, like the "Pitch Accuracy test", "Pitch training", and "How to find your own authentic voice" article.