Deep Purple Mk.II continued rehearsing at Hanwell Community Centre. One of Gillan's first contributions to the band during these rehearsals was the vocal melody and lyrics to "Child in Time". At Hanwell, the band wrote what would eventually become most of "In Rock" during 1969, though they were interrupted in September to perform Lord's "Concerto for Group and Orchestra", a one-off performance in September at the Royal Albert Hall with the Royal Philharmonic Orchestra. Gillan, along with Blackmore, was initially unhappy at having to perform the concerto, and wrote the lyrics to the second movement on the afternoon of the performance on a napkin in an Italian restaurant.