Question: Which singer is a multi-instrumentalist, Charlie Simpson or Rod Evans?

Context paragraphs:
Far Beyond a Distant Sun – Live Arlington, Texas: Far Beyond a Distant Sun - Live in Arlington Texas is Captain Beyond's only official live album.  It was recorded in 1973, after the release of "Sufficiently Breathless", with the four original members reuniting for a brief tour before Rod Evans left.  The album was recorded at the University of Texas at Arlington in support of King Crimson.

Dawn Explosion: Dawn Explosion, the third and final album by Captain Beyond, was released in 1977.  Original singer Rod Evans was replaced by Willy Daffern, and original drummer Bobby Caldwell had rejoined the band.

Charlie Simpson: Charles Robert "Charlie" Simpson (born 7 June 1985) is an English singer, songwriter and musician.  He is the youngest member of multi-BRIT Award-winning band Busted, and is the lead vocalist, guitarist in post-hardcore band Fightstar.  AllMusic has noted that Simpson is "perhaps the only pop star to make the convincing transition from fresh-faced boy bander to authentic hard rock frontman".  Simpson is a multi-instrumentalist, playing guitar, keyboard, piano and drums.

Tony Flynn (musician): Tony Flynn is a rock guitarist best known for his stints with Steppenwolf and an unauthorized 1980 "reunion" of Deep Purple.  He was originally hired to play with Steppenwolf in 1977 to fill in for Kent Henry, and found himself called upon multiple times until 1980, at which point John Kay and Jerry Edmonton won back the exclusive rights to the Steppenwolf name.  Shortly thereafter, Flynn joined the "new" Deep Purple, which included original singer Rod Evans (who had left the band a decade before) and a lineup of replacement players which included Flynn's former Steppenwolf bandmates Geoff Emery (keyboards) and Dick Jurgens (drums).  Later that year, after the group had played a string of poorly received concerts, former Purple guitarist Ritchie Blackmore, along with managers Tony Edwards, John Coletta and Bruce Payne sued Evans and won both $672,000 in damages and a permanent injunction against Evans and his cohorts using the name "Deep Purple," ending Flynn's association with the band.

Black Night: "Black Night" is a song by British hard rock band Deep Purple, first released as a single in June 1970 and later included on the 25th Anniversary version of their 1970 album, "In Rock".  The song became a hit following its release, peaking at No. 2 on UK charts, and to this day remains Deep Purple's highest charting UK single.  It topped the charts in Switzerland, and is one of only two singles from the band to chart in Ireland, peaking at No. 4, thus making it the group's only Irish Top 10 hit.  It was also the second single penned by the band, the first being the flop "Emmaretta", which was co-written by original singer Rod Evans.

Deep Purple in Rock: Deep Purple In Rock, also known as In Rock, is the fourth studio album by English rock band Deep Purple, released on 3 June 1970.  It was the first studio album recorded by the classic Mark II line-up.  Rod Evans (vocals) and Nick Simper (bass) had been fired in June 1969 and were replaced by Ian Gillan and Roger Glover, respectively.

List of Deep Purple band members: Deep Purple are an English hard rock band from Hertford, Hertfordshire.  Originally known as Roundabout, the group formed in March 1968 featuring vocalist Rod Evans, guitarist Ritchie Blackmore, bassist Nick Simper, drummer Ian Paice and keyboardist Jon Lord.  This first lineup of the band, known as Mark I, released three albums within the space of a year – "Shades of Deep Purple", "The Book of Taliesyn" and "Deep Purple" – before Evans and Simper were fired from the band at the request of Blackmore and Lord.  Mark II of Deep Purple saw Ian Gillan and Roger Glover replace Evans and Simper, respectively, in the summer of 1969.  This lineup of the band has since been identified as their most successful, with their next four albums reaching the top four of the UK Albums Chart, including number-one albums "Fireball" and "Machine Head".

Bogus Deep Purple: In 1980, ex-Deep Purple vocalist Rod Evans was contacted by a management team who offered him a chance to play under the Deep Purple name again, which he took.  He fronted this band of unknown session musicians, which became known to Deep Purple fans as the Bogus Deep Purple.  The band played across the US, Canada and Mexico, with many shows ending in riots.

Rod Evans: Roderic Evans (born 19 January 1947) is an English former singer.  In the late 1960s he began his professional career in The Maze, formerly MI5, after which he was a member of the original Deep Purple line-up who produced three studio albums with a more progressive and pop driven sound.  After recording a solo single, he was a member of the original Captain Beyond line-up, who produced two studio albums.  After a legal struggle with Deep Purple in 1980, Evans turned reclusive and disappeared from public life.

Sufficiently Breathless: Sufficiently Breathless, the second album by Captain Beyond, was released in 1973 and features a jazzier, smoother sound than its predecessor, reminiscent of mid-1970s Santana.  The medley format of the first album is retained only for the last six minutes of "Sufficiently Breathless": "Voyages of Past Travellers" flows directly into "Everything's a Circle", which in turn is actually two distinct songs despite being listed under a single title.  Original drummer/songwriter Bobby Caldwell had been replaced by Marty Rodriguez in the band, and subsequently Lee Dorman was credited as writing the songs on the album for legal reasons, due to Rhino and Rod Evans being in litigation with Iron Butterfly and Deep Purple respectively.  

Supporting paragraphs: Charlie Simpson Rod Evans
Answer: Charles Robert "Charlie" Simpson