Corey Bergmans son, Jared, was 20 years old, a college student who dabbled in drums and keyboard and was a fan of the Dave Matthews Band, when he died from a viral infection on March 26, 2010.

When a tragedy like this happens, theres one of two ways a person can go, Bergman tells PEOPLE. They can fall down and collapse or get up and move forward to try to make a difference.

Bergman and his wife Edda decided to make a fresh start after the tragedy, moving from New York to Miami in 2012. Shortly after, Bergman, now 60, started volunteering at Miami Childrens Hospital and Joe DiMaggio Childrens Hospital. Bergman, who had been playing guitar since he was 11 and has been in a band for many years, would play for patients and their families.

He would even let the kids play his guitar, but it was a bit too big for the youngest kids small hands. So he decided to try teaching kids the ukulele. Placing it in the hands of one little girl at Joe DiMaggio Childrens Hospital, it was magical, Bergman tells PEOPLE.

She ended up taking it home, and every time she came into the hospital for repetitive treatments, she would show him her progress in learning how to play the ukulele.

In January 2014, he and Edda founded the Ukulele Kids Club, a non-profit that donates ukuleles to childrens hospitals around the country. In all, they have supplied 500 ukuleles to 81 childrens hospitals so far, thanks to donations from musicians.

Bergman gets in touch with hospitals music therapists and sends them five ukuleles at a time. The therapists then select patients they think would enjoy the instrument and work with them to teach them how to play. The kids sometimes write songs of their own.

Stephanie Epstein, 26, a music therapist at Holtz Childrens Hospital at Jackson Memorial in Miami, made up a silly song with her patients about the hospital blues. In the song, they complained about the uncomfortable bed, not being able to sleep when they want and how much the needles hurt.

Song writing can be a really wonderful way to express what theyre feeling in a safe and secure way, Epstein tells PEOPLE.

Her patients cant get enough of Let It Go from Frozen and Taylor Swift songs.

I think I can play Frozen in my sleep, Epstein says.

All of the kids are able to take the instrument home with them.

When I enter a patients room, they immediately perk up because its the one thing in the hospital that doesnt have any negative side effects, Kathleen Humphries, 27, a music therapist at Sutter Childrens Center in Sacramento, California, tells PEOPLE.

Humphries helped Taylor Andrews, 17, discover his passion for playing the ukulele while he was in and out of the hospital treating his cancer from July 2013 to October 2014 before switching to outpatient chemotherapy.
She started off by teaching him his favorite song, Im Yours by Jason Mraz.

Its an uplifting song so I get happy when I play it, Taylor tells PEOPLE.

Since Taylor was able to bring the ukulele home, his friends now come over and they play music together.

One will grab a guitar, another will grab a ukulele and they just sit around and enjoy themselves, Dana Andrews, Taylors mom, tells PEOPLE.

I feel relaxed when I play the ukulele, like nothing really matters, Taylor says. You just play and have fun and keep practicing and then as you get better, you feel more accomplished.

The Ukulele Kids Club hopes to donate a minimum of 1,000 ukuleles in 2015 and bring more music therapists into hospitals.

A ukulele is so simple and so joyous, you cant not love it, Bergman says. Thats why I plan on working hard to continue to introduce children to the beauty of music.