131K accounts from Soundwave (soundwave.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesGendersGeographic locationsNamesPasswordsSocial connections
In approximately mid 2015, the music tracking app Soundwave suffered a data breach. The breach stemmed from an incident whereby "production data had been used to populate the test database" and was then inadvertently exposed in a MongoDB. The data contained 130k records and included email addresses, dates of birth, genders and MD5 hashes of passwords without a salt.
Source: Have I Been Pwned (CC BY 4.0)