Check for Provide an accessible overview (MOS:INTRO): Done
Major Point 1: Background and composition "The song was written by Aguilera, Claude Kelly and C. "Tricky" Stewart, with production was handled by Stewart. It is an electropop song with hip hop elements talks about getting glam and sexy before a night out. According to Aguilera and Kelly, "Glam" was a throwback to Madonna's "Vogue" (1990)." & "At first, the track was planned to be the lead single from Bionic, however "Not Myself Tonight" was released instead." (summarised well in the lead)
Major Point 2: Critical reception ""Glam" received mixed reviews from music critics, with some praised it as one of the best uptempo tracks on the album, while others named it dull and criticized that the song was not as good as "Vogue"." (summarised well in the lead)
Major Point 3: Chart performance "Upon the release of Bionic, "Glam" peaked at number two on the South Korean International Download Chart and number 42 on the main South Korean Download Chart." (summarised well in the lead)
Check for Relative emphasis: Done
Major Point 1: Background and composition "The song was written by Aguilera, Claude Kelly and C. "Tricky" Stewart, with production was handled by Stewart. It is an electropop song with hip hop elements talks about getting glam and sexy before a night out. According to Aguilera and Kelly, "Glam" was a throwback to Madonna's "Vogue" (1990)." & "At first, the track was planned to be the lead single from Bionic, however "Not Myself Tonight" was released instead." (the lead gives due weight as is given in the body)
Major Point 2: Critical reception ""Glam" received mixed reviews from music critics, with some praised it as one of the best uptempo tracks on the album, while others named it dull and criticized that the song was not as good as "Vogue"." (the lead gives due weight as is given in the body)
Major Point 3: Chart performance "Upon the release of Bionic, "Glam" peaked at number two on the South Korean International Download Chart and number 42 on the main South Korean Download Chart." (the lead gives due weight as is given in the body)
Simon, I'm very happy and inspired to see your work here. As per the above checklist, there are no issues with the article and it’s a GA. However, I think a minor fix is needed.
1a issue: "[Aguilera] chants deadpan before letting loose a creamy belt that evokes an earthier version of Whitney Houston in her prime"