The Watery Relic - Tomohito Nishiura (Rogue Galaxy)

Guitar OST

Nocturne of Amestris ~Duet~ - Akira Senju (Fullmetal Alchemist Brotherhood)

Guitar OST/Piano OST

Miror B. - Tsukasa Tawada (Pokemon XD: Gale of Darkness)

Guitar OST/Techno OST

Sweet Memories - Tomohito Nishura (Rogue Galaxy)

Guitar OST

Koko Wa Samurai No Kuni Da - Kamagata Eiichi (Gintama)

Piano OST/Orchestral OST/Guitar OST

Kanae no Kimochi [Kanae’s Feelings] - Tenmon (Byōsoku Go Senchimētoru) (5 Centimeters per Second)

Guitar OST

Main Menu - Chikayo Fukuda (Naruto Shippuden: Ultimate Ninja Storm 2)

Piano OST/Guitar OST

Seaside Hill (Classic Remix) - Jun Senoue (Sonic Generations)

Guitar OST

Peace of the World - Tomohito Nishiura (Dark Chronicle; Dark Cloud 2)

Guitar OST

Kouya ni Hitori - Naoki Sato (Eureka Seven)

Guitar OST/Orchestral OST

At Zanarkard (Acoustic Vers) - Original by Nobuo Uematsu Arr. Yuji Sekiguchi (FFX)

Guitar OST

(Source: violaode8bits.com.br, via gamermusic)

Kaze no Toorimichi (The Path of Wind) Guitar Vers. - Joe Hisaishi; Preformed by Daisuke Minamizawa (Totoro; Tonare No Totoro)

Guitar OST

(Source: foreverghiblimelodies)

Kibou no Miyako, Windbloom - Yuki Kajiura (Mai-Otome)

Orchestral OST/Guitar OST/Piano OST/Cello OST

Happiness in My Hand - Motoi Sakuraba (Tales of the Abyss)

Harp OST/(Guitar OST?)

(Source: music-in-games)