Prior to the demise of the print edition of The Independent, Marsden wrote a technology column for nearly ten years, along with other columns on a range of subjects for the daily paper and the Saturday magazine. He previously wrote The Observer Music Monthly's "Guitarist Wanted" column, which required him to go undercover to audition for bands that he had no intention of joining. Apart from music and technology writing, Marsden is well known for his humorous, offbeat features written in an understated, self-deprecating style. Other publications he has written for include The Guardian, Time Out, New Statesman, Daily Telegraph and Olive magazine. His first book, FWD This Link, was published by Rough Guides in 2008 and his next, The Next Big Thing followed a year later. A third, Crap Dates: Disastrous Encounters From Single Life, was published in February 2012 and featured stories of people's terrible dates that were initially shared on Twitter and subsequently went viral.
From 1990–95 Marsden played guitar in London art-punk collective The Keatons, who notably supported Blur on their first tour of the UK but were thrown off for unprofessional conduct – as documented in Blur's biography, 3862 Days. He also sang with Gag, who recorded a Peel Session in 1993 – although Marsden had an earlier run-in with John Peel at the age of 17 when his fanzine, Glottal Stop, was the subject of a piece on Peel's show on BBC Radio Cambridgeshire.
In 2007 he worked on a DIY music project called "The Schema" – an attempt to get a single written, recorded, released and promoted on the internet in the space of a month. The accompanying video, directed by Alex de Campi and featuring Marysia Kay, became a hit on YouTube, but the single sold poorly.
He currently plays with Scritti Politti, Kev Hopper's project Prescott and the TV theme tribute band Dream Themes. He also played regularly in Frank Sidebottom's Oh Blimey Big Band before creator Chris Sievey's death in 2010. A multi-instrumentalist, he has produced several recordings for bands including Spearmint, and has released three albums of his own music under the name The Free French on Spearmint's record label, Hitback Records.
- Marsden, Rhodri (1 October 2007). "Playing At Trains". Retrieved 2007-10-01.
- Pax, Salam; Marsden, Rhodri; Wright, Gregor (19 April 2004). "Blog all about it". Arts. Guardian Unlimited. Retrieved 2007-09-27.
- FWD This Link, Amazon.co.uk
- The Next Big Thing, Amazon.co.uk
- "Crap Dates: Disastrous Encounters From Single Life: Amazon.co.uk: Rhodri Marsden: Books". Amazon.co.uk. Retrieved 2012-08-20.
- Yu, Justin (22 August 2011). "First dates from hell exposed in 140 characters | Crave – CNET". News.cnet.com. Retrieved 2012-08-20.
- Marsden, Rhodri (4 September 2007). "After becoming the No.1 sensation on YouTube can Rhodri Marsden take the charts by storm?". The Independent. Retrieved 2011-04-22.
- "The Lexington". The Lexington. Retrieved 2012-08-20.
- Rhodri.biz, Marsden's official site