Castiglia has variously worked alongside Junior Wells, Sandra Hall, Aron Burton, Pinetop Perkins, Melvin Taylor, Sugar Blue, Phil Guy, Ronnie Earl, Billy Boy Arnold, Ronnie Baker Brooks, John Primer, Lurrie Bell, Jerry Portnoy, Larry McCray, Eddy Clearwater and Otis Clay.
It contained his versions of the Junior Wells song, "Hoodoo Man Blues" and The Shadows' "The Rise and Fall of Flingle Bunt".
[11] In April 2008, These Are the Days was released, which included Castiglia's tribute to his former employer Junior Wells called "Godfather of the Blues", as well as cover versions of Bob Dylan's "Catfish", Nappy Brown's "Night Time Is the Right Time", Fenton Robinson's "Somebody Loan Me a Dime", and Little Willie John's track "Need Your Love So Bad".
[3] Keepin On (2010), recorded in Dover, New Jersey, featured five tracks written by Castiglia, plus covers of songs by John Lee Hooker ("Goin' Upstairs"), Mack Rice ("Cadillac Assembly Line"), T-Bone Walker ("My Baby is Now On My Mind"), Peter Green ("I Could Not Ask for More"),[3] Robert Nighthawk ("Murderin' Blues") and Bob Dylan ("Till I Fell In Love With You").
[13] It contained the Lefty Dizz-penned track "Bad Avenue", Castiglia's version of the blues standard, "Goin' Down Slow", and a cover of the Rolling Stones, "Sway".