Weaver's band performed as Wynder K. Frog and became popular on the student union and club circuit of the mid sixties. A brief merging of this band with Herbie Goins and the Night-Timers took his work to a higher level. Wynder K. Frogg—they are billed under this spelling—appeared on the bill at The Savile Theatre, London on 24 September 1967 supporting Traffic on their first U.K. presentation. Also on the bill were Jackie Edwards and Nirvana. The compere was David Symonds.
All tracks featured Mick Weaver as Wynder K. Frog, playing a Hammond B3 organ and were recorded in London playing over backing tapes by unnamed session musicians from New York. In the album liner notes Jimmy Miller noted that Weaver had "supplemented the band with trumpet, tenor sax, guitar, bass and drums, Wynder has transformed the organ into a highly enjoyable medium of sound, combining jazzy finesse with popular and commercial phrasing suitable for vast appeal".
Into the Fire was released only in the US, after the band had dissolved. Unlike the previous albums of mostly covers, the liner notes here state that the songs were, "composed specifically for the Frog style of musical interpretation, ranging far in beat, tempo and mood".
Joynson, Vernon. The Tapestry of Delights - The Comprehensive Guide to British Music of the Beat, R&B, Psychedelic and Progressive Eras 1963-1976. Borderline (2006). Reprinted (2008). ISBN 1-899855-15-7