| Wonder Days | ||||
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| Released | 11 February 2015 | |||
| Studio | Rockfield Studios (Monmouth, Wales) | |||
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| Length | 48:03 | |||
| Label | earMusic | |||
| Producer | Luke Morley | |||
| Thunder studio album chronology | ||||
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| Singles from Wonder Days | ||||
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| Alternate covers | ||||
 iTunes deluxe edition cover | ||||
| Alternative cover | ||||
 Physical deluxe edition cover | ||||
Wonder Days is the tenth studio album by English hard rock band Thunder. Recorded in late 2014 at Rockfield Studios in Monmouth, Wales, it was produced by the band's lead guitarist Luke Morley and released internationally by earMusic in February 2015. Wonder Days was the first Thunder studio album to be released since Bang! in 2008, as well as the band's first release on earMusic with whom they signed after returning from their second breakup in 2014.
After breaking up for a second time in 2009, Thunder returned occasionally for a number of shows between 2011 and 2014, before recording a tenth studio album later in the year. Morley wrote all of the material for the album, with the exception of "Black Water" which was co-written by Saint Jude vocalist Lynne Jackaman. Much of the album does not feature guitarist and keyboardist Ben Matthews, who spent most of 2014 recovering from head and neck cancer.
Wonder Days debuted at number 9 on the UK Albums Chart, marking the band's first top ten album since Behind Closed Doors reached number 5 in 1995. The album also charted in Germany and Sweden for the first time in 20 years, and topped the UK Rock & Metal Albums Chart. "Wonder Days", "When the Music Played" and "Resurrection Day" were released as singles, while the extended play (EP) Killer was made available as part of various album bundles.