and Valensi are planning to write songs together for other artists. He also co-wrote the track "Hostage" on Sia's 2014 album 1000 Forms of Fear. Other credits include co-writing with Brody Dalle in 2014, Kate Pierson for her 2015 album Guitars and Microphones, Kesha, and again with Sia for the 2017 Blondie track, "Best Day Ever." Instruments and influences Valensi's main guitar, which he uses for nearly every live show and recorded song, is a 1990s Epiphone Riviera with Gibson P-94 pick-ups, which was given to him by friend and fellow Strokes guitarist Albert Hammond Jr. In a 2004 interview with Epiphone, he called it "the greatest guitar never made" because Gibson had never produced a semi-hollow with humbucker-sized P-94 pickups. He has several models in different colours (all with P-94s), including multiple naturals, one in vintage sunburst, one in red, and a 12-string elite in red. In 2005, Epiphone released a signature model of his guitar, the Elitist Nick Valensi Riviera P-94, and followed it up with a standard model Nick Valensi Riviera P-94 in 2007. Back-up/warm-up guitars include an Epiphone Dot fitted with 2 P-94s, an Epiphone Casino, an Epiphone Sheraton, and a Gibson Faded Special Double Cutaway with 2 P-90s. Valensi often borrows fellow Strokes guitarist Albert Hammond, Jr.'s backup guitars, which include a Gibson Les Paul Jr. and a Les Paul Special. New guitars used for the First Impressions of Earth tour include a Les Paul Custom in black, a Fender Telecaster Custom (which he can be seen using in the music video for Under Cover of Darkness ), and a Duesenberg semi-hollow. Valensi's main amplifier is a 2x12" Fender Hot Rod DeVille, used with Fender 4x12" extension cabinets during live shows. He also recently purchased a Carr amplifier to use on the last few stops of the First Impressions tour. His pedalboard consists of a Visual Sound Jekyll & Hyde Ultimate Overdrive pedal, Boss TR-2 Tremolo, Vox Cooltron Bulldog Distortion, MXR Micro Amp (2) and a Boss TU-2 Chromatic Tuner. He has also been seen with an Electro Harmonix Memory Man and a Boss Blues Driver. His recent pedalboard consists of a Fulltone GT-500 Distortion/Booster, a Korg Pitchblack Tuner, A Visual Sound Visual Volume Pedal, a Visual Sound Double Trouble dual overdrive, a Maxon Distortion Master, an Electro-Harmonix XO Holy Grail Reverb, an Electro-Harmonix Deluxe Memory Man, and an MXR Micro Amp Boost. He uses