Träd, Gräs och Stenar ("Trees, Grass and Stones") is a Swedish rock band formed in 1969. The group was one of the front acts in the progressive music scene in Sweden, although noticeably less political than their contemporary counterparts. The band Pärson Sound was formed during the summer of 1967, then consisting of guitarist Bo Anders Persson, Thomas Tidholm on vocals, saxophone and flute, Arne Ericsson on cello, Urban Yman on violin, Torbjörn Abelli on bass and Thomas Mera Gartz on drums.

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