On Thursday, March 14, he posted his Jodi Arias song - which includes the lyrics "18 days on the stand in the Arizona Sun, they tried Jodi Arias, for murder one" - on YouTube.
As of Friday evening, it had gotten 270 hits.
In addition to being a musician, Harpman is also a process server for Maricopa County Courts.
"Court officer by day; musician by night," he said.
Given Harpman's day job, he has taken a special interest in the trial of Jodi Arias.
"I think it's because she's got no expression, no feeling," he said. "I really do. There's no remorse that I can see."
Harpman took his thoughts and put them to music.
One part of the song reads, "Jodi is a narcissist in the enth degree; never feeling sorrow for her brutality."
Harpman's wife Katie Romero, who encouraged her husband to write the song, admits she's obsessed - having watched every day of the Arias trial on TV.
"It's (the song) more of 'we miss you, even though we don't know you,'" she said. "And, that we're thinking about you and hopefully this song will uplift the Alexander family."
Harpman, who doesn't agree with his wife's support of the death penalty, hopes the trial will end like his song - "If you ask me, bye bye" - with Arias convicted of first-degree murder and sentenced to life in prison.
Copyright 2013 CBS 5 (KPHO Broadcasting Corporation). All rights reserved.
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