Although he composes music mostly in the symphonic metal/black metal genres, Maudling's main influences include mostly non-metal bands such as The Police, Tangerine Dream, Queen, Pat Metheny, as well as classical composers such as Wagner, Stravinsky, Tchaikovsky, Messiaen and Holst.
Maudling was born in Kent in 1971, and grew up in Sheffield, Yorkshire. In Kent, Maudling's parents lived opposite a music store. The store owner, Terry Bradford, who ended up representing Britain on the TV show A Song For Europe in the 1970s, was a friend of Maudling's father and received free records, most of which were classical, contemporary music and Jazz.Jonny grew up listening to these records, educating himself in a wide variety of musical styles. He had private piano instruction, working through the Royal Academy of Music grade system under Elizabeth Hydes.
At school in South Yorkshire, he learnt to play guitar and bass guitar. He played in various bands in his teen years, performing gigs in pubs and nightclubs around the area. He started song writing at this time. He bought his first synthesizer in the mid 1980s with the money he earned working on Saturdays. After completing school, Maudling tried out for music college, but was considered a borderline candidate with substandard sight-reading ability. He opted instead to concentrate on band work.
In the late 1980s and early 1990s Maudling played bass, sang and composed songs for a thrash metal outfit called Igniter. Brought together from Maudling's musical friends, Jansen Ward (Drums) and Richard Wilson (Guitar), this band recorded two demos (Fellowship of Madness and Falter From Existence) and performed gigs around England, the most high profile of which was a support slot with prominent thrash metal outfit Xentrix, and also got a slot on the radio one rock war in 1991 and came second in the first round, with a song called Falter From Existence, from the demo of the same title with John Betambeau stepping in for vocal duties.
Through Alistair MacLatchy, a former bandmate in Systematic Insanity with prominent extreme metal drummer Nicholas Barker, Maudling was introduced to vocalist/lyricist Byron Roberts in 1993. For several years, Roberts had been looking for talented musicians with whom to launch his symphonic black metal band Bal-Sagoth, but had been unable to meet anyone willing to commit to the project. As a result of MacLatchy's introductions, Jonny, his brother Chris and Byron began working together in a band environment.
This new outfit went loosely under the provisional name of "Dusk" for several months, as MacLatchy did not like the name Bal-Sagoth, nor the symphonic black metal direction which Roberts had suggested. Because of creative and musical differences in direction and style, the band soon parted ways with MacLatchy. With the introduction of keyboards, the band found their focus. Roberts had the creative team he had long sought to execute his conceptual vision. For Maudling, this represented an opportunity for creative musical freedom. Roberts, an English post-grad with an interest in 20th century pulp sci-fi writers, could finally implement the ideas he had had for years. The formal inception of Bal-Sagoth occurred during the summer of 1993.
On the strength of their demo which they recorded during December 1993, the band were signed by Cacophonous Records, a then small subsidiary of Vinyl Solution based in London. Later, they would sign to Nuclear Blast for three albums, recording a total of six albums to date.
Maudling composes the music for Bal-Sagoth, sometimes incorporating ideas from his brother, guitarist Chris. He played drums on the first three albums and during subsequent tours, using a session keyboard player, but in 1999 Maudling opted to concentrate full-time on keyboards, handing drum duties off to Dave Mackintosh (Dragonforce).
Maudling also played keyboards on the My Dying Bride albums The Light at the End of the World and The Dreadful Hours, and composed and recorded all the music for the My Dying Bride release Evinta, based on the existing compositions as originally written by Andrew Craighan, Hamish Glencross, et al. He has also contributed keyboard session work to bands including Semargl and Sermon of Hypocrisy.
In February 2013, Maudling helmed Kull, a new project in the symphonic metal sphere.
Maudling has used various keyboards and synthesizers over the years including Casio CZ-1000, Yamaha Dx21, Korg M1, Roland XP-50 and Roland Fantom X7, Korg Kronos X.