Tony Jeff MacAlpine (born August 29, 1960, in Springfield, Massachusetts) is an American guitarist and keyboardist. Having released ten studio albums over a career spanning more than two decades, he is best known as a solo guitarist; although he has worked with many different bands and musicians, such as Planet X, Steve Vai, Vinnie Moore, Mark Boals and Vitalij Kuprij.
MacAlpine influenced and contributed much to the neo-classical movement of the late-1980s, becoming known for his instrumental rock-based style of playing that blended elements of shred, blues and fusion. Together with his first two solo albums, Edge of Insanity (1986) and Maximum Security (1987), MacAlpine played a prominent role on other albums of the 1980s shred era, including keyboard work throughout Vinnie Moore's Mind's Eye (1986) and Joey Tafolla's Out of the Sun (1987).
As a further indication of MacAlpine's dual dexterity on both the guitar and keyboards, he has made contributions as a guitarist accompanying renowned keyboardists Vitalij Kuprij and Derek Sherinian (latterly with the band Planet X) and, additionally, once provided vocals for his sole non-instrumental release, Master Of Paradise (1999). In recent years, he has played guitar and keyboards in Steve Vai's touring band, The Breed (until 2006), and is featured on the band's Live at the Astoria London DVD, as well as on the G3 DVDs, G3: Live in Denver (2003) and G3: Live in Tokyo (2005).