In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: After the release of Pink Floyd's 1983 album The Final Cut, viewed by some as a de facto solo record by bassist and songwriter Roger Waters, the band members worked on solo projects. Guitarist David Gilmour expressed feelings about his strained relationship with Waters on his second solo album, About Face (1984), and finished the accompanying tour as Waters began touring to promote his debut solo album, The Pros and Cons of Hitch Hiking. Although both had enlisted a range of successful performers, including in Waters' case Eric Clapton, their solo acts attracted fewer fans than Pink Floyd; poor ticket sales forced Gilmour to cancel several concerts, and critic David Fricke felt that Waters' show was "a petulant echo, a transparent attempt to prove that Roger Waters was Pink Floyd". Waters returned to the US in March 1985 with a second tour, this time without the support of CBS Records, which had expressed its preference for a new Pink Floyd album; Waters criticised the corporation as "a machine".
After drummer Nick Mason attended one of Waters' London performances in 1985, he found he missed touring under the Pink Floyd name. His visit coincided with the release in August of his second solo album, Profiles, on which Gilmour sang. With a shared love of aviation, Mason and Gilmour were taking flying lessons and together bought a de Havilland Dove aeroplane. Gilmour was working on other collaborations, including a performance for Bryan Ferry at 1985's Live Aid concert, and co-produced the Dream Academy's self-titled debut album.In December 1985, Waters announced that he had left Pink Floyd, which he believed was "a spent force creatively". After the failure of his About Face tour, Gilmour hoped to continue with the Pink Floyd name. The threat of a lawsuit from Gilmour, Mason and CBS Records was meant to compel Waters to write and produce another Pink Floyd album with his bandmates, who had barely participated in making The Final Cut; Gilmour was especially critical of the album, labelling it "cheap filler" and "meandering rubbish". The lawsuit left Waters with only one other option: to formally resign from Pink Floyd to protect himself from a lawsuit that, he said, "would have wiped me out completely".According to Gilmour, "I told [Waters] before he left, 'If you go, man, we're carrying on. Make no bones about it, we would carry on', and Roger replied: 'You'll never fucking do it.'" Waters had written to EMI and Columbia declaring his intention to leave the group and asking them to release him from his contractual obligations. He also dispensed with the services of Pink Floyd manager Steve O'Rourke and employed Peter Rudge to manage his affairs. This left Gilmour and Mason, in their view, free to continue with the Pink Floyd name.
A:
What is the last name of the person that the guitarist expressed their feelings about on their second album?