Helihool Mittetulundusühing was Estonian non-profit association established in 2019 in Tallinn. As of July 7, 2022 it is reorganized into 2 separate companies:

MTÜ Mariupoli Sõbrad to help war refugees:

• organising transfers,
• tickets & food procurement,
• accommodation in Estonia,
• consultations,
• any other ways that may be needed to help the refugees

MTÜ Helihool Music to make high-quality live music accessible:

• for patients in hospitals and care homes,
• for war refugees,
• for kids,
• for the general public, who would get positive effect from the live music

Mariupoli Sõbrad MTÜ, registry code 80574100,
registered on 03.12.2019 at Harju maakond, Tallinn, Kesklinna linnaosa, Veskiposti tn 2-1002, 10138