Green Crystal Ties, Volume 4: Mind-Expanding 60s Psychedelia is the fourth installment in the Green Crystal Ties series of psychedelic and garage rock compilations issued by Collectables Records. It was released on April 7, 1998 and like volume 1 features songs by Texas garage and psychedelic bands who recorded in the 1960s. The series is known for good quality mastering and sound quality. Like all of the entries in the series, the highly colorful packaging is designed by Nicole Ruhl Fichera. The inner sleeve includes well-researched liner notes written by Steve Kaplan and Matt Wendelken which provide helpful biographical information about the bands and their songs.