Liepiņš has written songs for choirs, solo artists, orchestras, films, theatres, and operas.

The first opera Liepiņs saw was Pyotr Tchaikovsky's The Queen of Spades in Liepāja Theatre in early childhood.

In 1970 band Santa took part in the festival Liepājas Dzintars where Liepiņš received an award for the best folk song arrangement.

[1] In the 1980s, Liepiņš became popular with numerous hits of the time (Vēl ir laiks, Viss kārtībā, Ceļojums, Dziesma par rozīti, Sentiments).

[4] In 1997 Liepiņš received the Latvian Music Award for the opera Parīzes Dievmātes katedrāle (Notre-Dame de Paris).