40 years since Blondie's 'Heart of Glass' was number one

It's been 40 years since Blondie's "Heart of Glass" topped the Billboard Hot 100 chart.

The band had written an earlier version of the song called "Once I Had a Love," but they weren't happy with the reggae feel of the arrangement. They also tried it as a ballad, but that didn't work, either.

Then, at the height of the disco craze, they decided to turn it into a disco dance song. The song's name was changed to "Heart of Glass," and it went No. 1 on the chart.

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