"Heartbeat / Tragedy" is the fourth single released by British pop group Steps. "Heartbeat", written by Jackie James, was the first ballad released as a single by the group. The single is also known as one of their Christmas songs as it was released near Christmas. Whilst promoting the 2012 Hit Factory Live event, Pete Waterman revealed that the song had been sat in a drawer for years before he gave it to the band to record.

The video for "Tragedy", originally a hit by the Bee Gees, contained the dance step of putting both hands parallel to the sides of the head in time with the word 'Tragedy', which became a trademark of the group. The single hit the number one spot in the UK Singles Chart after eight weeks on that chart. "Heartbeat / Tragedy" spent a total of 30 weeks in the chart, and sold more copies than all three previous Steps singles combined, with 1.21 million copies sold in the UK. Heartbeat features Claire and Faye singing the first two verses. Lisa performs the middle eight, followed by Claire. The rest of the group join in for the choruses. Tragedy features again Faye and Claire singing the verses, with the rest of Steps joining in for the choruses.

The music video for "Heartbeat" is set in snowy surroundings. It begins with Steps riding a sleigh while an evil Ice Queen has her sights set on Ian "H" Watkins; she is watching an image of on the tiny pond in her throne room. The group are staying in a lodge, and H goes out back to fetch some wood for the fire. The Ice Queen decides that this is the time to strike, and she sends her three dwarf guards to kidnap H. They jump H, and the Ice Queen casts a spell, knocking him out. By the time H wakes up, he is in the back of their sleigh. The rest of the group come out and find H is missing, finding only a little sword carried by one of the guards. On skis and snowmobiles, they set off to rescue H. Along the way to the Ice Queen's castle, they stop at a barn, finding absolutely nothing. Arriving at the castle, they break into the throne room where H is tied up in the middle of the frozen pond. Faye Tozer, Lee Latchford-Evans and Claire Richards easily take care of the guards (while H is able to free himself), and Lisa Scott-Lee defeats the Ice Queen with a karate kick to the chin. The group then return to the lodge for a Christmas party.

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