McMahon began recording with his pop group Lucky Pierre in 1974, releasing a number of vinylsingles though 1981. Lucky Pierre initially consisted of: John Guciardo- Lead Guitar, Brian Dempsey- Drums, Dennis DeVito- Bass and McMahon on Guitar & Lead Vocals. In 1976, Tom Lash joined the band on bass guitar, and DeVito moved to guitar. Tom Miller played keyboards at this time. In 1977, Dempsey left the band and was replaced by drummer Gary Shay, and then drummer Dave Zima. After many live shows, both Tom Miller and John Gusciardo left Cleveland for California and DeVito switched to lead guitar. Many showcase concerts, radio broadcasts, and a few 45RPM singles followed. Lucky Pierre continued as a four-piece outfit, sometimes augmented by horns and vocalists to perform the array of song styles McMahon was developing. McMahon then went on hiatus until 1988, when Lucky Pierre recorded the CommuniquéEP with Guciardo, Lash, Zima, and friend Trent Reznor making guest appearances. The 1988 line-up of Lucky Pierre included Trent Reznor (then of the Exotic Birds, later of Nine Inch Nails), and was managed by Exotic Birds/NIN manager John Malm, Jr.. Lucky Pierre disbanded again after the recording of Communiqué, but McMahon remained in contact with Reznor and Malm.
During the early 1990s, McMahon began his second musical project, the industrial rock band Prick. Prick was eventually signed to Reznor and Malm's Nothing Records label. The band's debut self-titled album was released in 1995, with Reznor producing four of the album's ten tracks. Prick's lead single, "Animal," received high rotation on MuchMusic and MTV, and Prick opened the US leg of Nine Inch Nails and David Bowie's Outside tour. Nothing's parent label, Interscope Records, dropped Prick before McMahon could record a follow-up. 
In the wake of this setback, McMahon went on another years-long hiatus from music. Prick reemerged in 2002 with The Wreckard, independently released by McMahon over the Internet, and featuring many songs once slated for the second, canceled Nothing Records album. Two years later, McMahon released Lucky Pierre's first full album, ThinKing, again selling the album independently online.
In October 2008, McMahon re-emerged with the hard-rock track "Runaway Brain," this time under the moniker ( sic ). The song was available from the fansite http://www.luckyprick.net/ for a limited time, with a note in the MP3's metadata noting, "prick or treat - derailing things to come from luckypierremusic - THIS NOVEMBER (or ...it all depends on the speed of green)".
In an interview released in March 2009 on the fansite http://www.luckyprick.net/ , McMahon talked about possible future releases, and also announced that http://www.luckypierremusic.com/ will be online again, with merchandising an re-releases of The Wreckard and ThinKing (in new packagings) for sale, and maybe re-mastered tracks of Lucky Pierre.
On June 21, 2009, luckypierremusic.com went live, offering digital downloads, new and vintage shirts and hats, and new CDs. As alluded to previously, The Wreckard and ThinKing are being reissued, and the Fear of Blue and (sic) album and EP are also being released. All of the music can be obtained through a six-CD package which features a Prick Live CD only available as part of the package.