Blue-Sky Research is Taproot's third major label album which was released on August 15, 2005 internationally and a day later in the United States. Smashing Pumpkins frontman Billy Corgan co-wrote three songs on the album. Deftones guitarist Stephen Carpenter and Jonah Matranga from Far and Onelinedrawing make guest appearances. The band wrote over 80 songs for the effort. "Calling" was released as the first single and was a moderate hit, while the second single, "Birthday", followed quietly. It is Taproot's last album with Atlantic Records, as both parties have decided to part ways. It has a different, softer, more alternative melody from the first two albums. The album has sold over 140,000 copies in the U.S., despite little label support.