String instrument rosin than players of lower-pitched instruments, who tend to favor darker, softer rosin. The ravanahatha is one of the oldest string instruments. Ancestors of the modern bowed string instruments are the rebab of the Islamic Empires, the Persian kamanche and the Byzantine lira. Other bowed instruments are the rebec, hardingfele, nyckelharpa, kokyū, erhu, igil, sarangi and K'ni. The hurdy-gurdy is bowed by a wheel. Rarely, the guitar has been played with a bow (rather than plucked) for unique effects. The third common method of sound production in stringed instruments is to strike the string. The piano and hammered dulcimer use
The Hurdy Gurdy Man Gurdy Man" were both released as singles well before the album was released. The recording sessions for the album are purported to have included future Led Zeppelin members Jimmy Page and John Paul Jones. Page was in The Yardbirds at the time and was actively looking to rebuild that band. The album credits John Bonham for percussion on the song and Clem Cattini as the drummer. All tracks credited to Donovan Leitch. According to BMI, "A Sunny Day" and "The River Song" were collaborations with David J. Mills, but "Tangier" was written solely by Mills under its original title of