1. Buttercup is the 13th, and final song on the album Landmark

2. ‘a Bravura performance’ ‘The album's final song, then, is also its centerpiece, summarizing its narrative and musical arcs in one Bravura performance.’

3. In Wait For The Ricochet: The Story of Deep Purple In Rock, authors Simon Robinson and Stephen Clarey say of "Bloodsucker" - Track 2 - it was the final song prepared for the album; written around the beginning of April 1970 towards the end of the sessions.