"Heart of Glass" is a film directed by Werner Herzog that was released in 1976, placing it in the 1970s. The film is known for its unique storytelling and visual style, featuring a cast that was influenced by Herzog's use of hypnosis. Set in a Bavarian glass factory, it explores themes of industrial decline and existential despair. The film's distinctive approach and Herzog's direction have made it a notable work in the realm of art cinema from that era.

In the context of the movie "Heart of Glass," directed by Werner Herzog, the phrase "Heart of Glass" symbolizes fragility and vulnerability, reflecting the emotional and existential themes of the film. It suggests a delicate state of being, where one's inner emotions and relationships can easily shatter. The film explores the impact of a lost connection to nature and spirituality, paralleling the fragility of human existence. The title encapsulates the characters' struggles and the ephemeral nature of their lives, akin to glass that can break at any moment.

"Heart of Glass" was sung by the American rock band Blondie and released in 1979. The song, written by Debbie Harry and Chris Stein, became one of the band's most iconic hits, blending elements of disco and new wave. It was featured on their third studio album, "Parallel Lines," and achieved significant commercial success, reaching the top of the charts in multiple countries. The song is recognized for its catchy melody and distinctive sound, contributing to Blondie's status as a leading band in the late 1970s and early 1980s.

Blondie's biggest hit of all time is "Heart of Glass." Released in 1979, the song became a massive success, reaching number one on the Billboard Hot 100 chart and solidifying Blondie's place in music history. It blends elements of disco, rock, and new wave, showcasing the band's unique sound. "Heart of Glass" is often credited for helping to popularize the new wave genre and remains one of Blondie's signature songs.