78violet (formerly known as Aly & AJ) is a American pop duo composed of sisters Aly and AJ Michalka. They signed a recording contract with Hollywood Records in 2004. Their debut album Into the Rush debuted at number 36 on the US Billboard 200, and was later certified gold by the RIAA. It has sold 839,000 copies domestically and one million worldwide. Their second album, Insomniatic, peaked at #15 on the Billboard 200, selling over 39,000 copies in its first week and becoming Aly & AJ's highest debut to date.

In 2009, Aly & AJ renamed themselves as 78violet and officially announced their departure from Hollywood Records the following year. In 2013, the sisters released their first single in five years, "Hothouse".