The Grateful Dead was one of the most beloved bands of the 1960s psychedelic era. They created a unique sound by combining rock with roots in bluegrass, folk, blues, and the improvisational style of jazz. They were part of a group of musicians that experimented with rock music, focused on the albums as a whole project instead of looking for hit singles. That evolution produced some of the best albums in rock history.

In conjunction, their concerts were musical marathons with no concern for time limits. From the 1960s through 1995, they played in about 2,300 concerts, often in freeform style, popularizing the jam band concept. They influenced songwriters, the creativity of improvisational musicians, and earned a passionate, loyal fan base.

The Grateful Dead’s concerts were advertised by some of the most collectible concert posters in the hobby. They featured psychedelic style, lush colors, and odd artistic choices that mirrored the often trippy experience of their music. One of their most famous concert posters is the Hippie Santa Claus poster.

The art for this poster, also known as FD-40 from the Family Dog series, was created by famed psychedelic era artist Victor Moscoso. The mischievous-looking Santa smirks at the viewer below a set of devil horns with a boldly contrasting red and green design behind him. To promote the other acts and concert details, Moscoso painted the information on Santa’s chest, give it a Christmas sweater look.

This poster for the Grateful Dead and Moby Grape concert at the Avalon sells for $275 in poor condition and up to nearly $1,000 for one in high grade.