Baek Ga-young (; born October 23, 1987), better known by her stage name Hello Ga-young (), is a South Korean singer-songwriter. Before beginning her solo project, she was a member of Joa Band, a Korean indie band, from 2009 to 2013. She debuted as a singer-songwriter in December 2013, with her first single "A Song of Old Lovers" (). Her albums were released by her independent music label helloeumak (), before she established a partnership with Interpark Entertainment in 2017. Except for some soundtrack appearances, all of her songs released to date were written by herself. From 2013 to present, Hello Ga-young has released two albums, three extended plays, and seventeen singles.
The musical career of Baek Ga-young began when she joined Joa Band as a bassist in 2009. Because Joa Band members would typically sing songs they wrote themselves, she began writing and singing her songs while in the band. Her first song in Joa Band was "Life Is Unpredictable (Hot Choco)" (). She composed and sang three more songs, "ì ì§Âë´ë 좠ì´ë ëÂÂ" (Literal meaning: "Are you doing all right?"), "길ì ìÂÂ기 ìÂÂôìÂÂ" (Literal meaning: "For the purpose of getting lost"), and "A World Without Time" (). "ì ì§Âë´ë 좠ì´ë ëÂÂ", which was her first song to be introduced on a television show, "2 Days & 1 Night" of KBS2.
In 2013, she started a small music label, helloeumak, with her friend Cheon See-woo () as an A&R executive. Her debut single, "A Song of Old Lovers", was released on December 30, 2013. On March 20, 2014, her first extended play "Opponent Process Theory" () was released, including two singles "A Song of Old Lovers" and "Just Because I Like You" (), and three more new songs: "I'm Coming to You" (), "Opponent Process Theory", and "Dish" ().
In 2015, Hello Ga-young released her first album, "Those Moments" (). The album ranked second within the first two weeks after the release at K-Indie Chart vol.48, a Korean independent music chart released twice a month by Mirrorball Music. Those Moments remained in the top 30 of the chart for 14 weeks (vol.48~vol.54, from February 11, 2015 to May 25, 2015). On July 9, 2015, she was featured on , a Korean music program owned by MBC Music, and performed "Sleepless Summer Night" and "A World Without Time".
Her musical career began in 2016 with the release of the second extended play Feelings () on January 19. In March, she announced her one-year music project, Collection Of Short Stories (). The first single of the project was "Collection Of Short Stories â Winter To Spring" (). Following the first single, "Collection Of Short Stories â Satellite" (), "Collection Of Short Stories â Hang In There When You Feel Down" (), and "Collection Of Short Stories â Where Is Love" () were respectively released in summer, autumn, and winter. She also wrote and published her first essay, "Sleepless Summer Night", during the project. The book's title was inspired by her single "Sleepless Summer Night" (), previously released in 2014, and each chapter's title was inspired by the titles of four singles of Collection of Short Stories. The project ended as her third extended play, Collection Of Short Stories (Almost Like Missing You), was released on March 17, 2017, including the four Collections Of Short Stories singles as well as her new song "Almost Like Missing You" (). The album ranked third at the K-Indie Chart vol.98. The chart has also noted that the album contains strong seasonal feelings.
When her second album something special () was released in 2019, she performed a solo concert celebrating the release at Ewha Girls' High School's 100th-Anniversary Hall, from February 16 to 17.