7.04M accounts from ReverbNation (reverbnation.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In January 2014, the online service for assisting musicians to build their careers ReverbNation suffered a data breach which wasn't identified until September the following year. The breach contained over 7 million accounts with unique email addresses and salted SHA1 passwords.
Source: Have I Been Pwned (CC BY 4.0)