In July 2009, when Umphrey's McGee performed at the Forecastle Festival, they were actively promoting their studio album "Mantis," which was released earlier that year in February. This album showcased the band’s progressive rock approach and further solidified their reputation for intricate compositions and improvisational prowess. The live performance of "Slacker" during this festival highlights their dynamic stage presence and tight-knit musicianship that fans have come to expect. Additionally, around this time, Umphrey's McGee was establishing a robust fanbase through extensive touring, leveraging the use of technology to enhance their live shows, such as the availability of high-quality recordings and their innovative approach to live setlists. This period marked a significant evolution in their sound and artistic direction, reflecting their growth since their formation in 1997.