Common chiffchaff one of the first avian signs that spring has returned. Its call is a "hweet", less disyllabic than the "hooeet" of the willow warbler or "hu-it" of the western Bonelli's warbler. The song differs from that of the Iberian chiffchaff, which has a shorter . However, mixed singers occur in the hybridisation zone and elsewhere, and can be difficult to allocate to species. When not singing, the common chiffchaff can be difficult to distinguish from other leaf warblers with greenish upperparts and whitish underparts, particularly the willow warbler. However, that species has a longer primary projection, a sleeker, brighter appearance
I Belong to Me Me Round (Like a Record)" and vote for the song that would become the second single. It was reported in early September that Simpson had chosen "I Belong to Me" as the second single. When asked in an interview whether she had written songs that were reflective of her life, Diane Warren named "I Belong to Me", saying "that's one of the closer songs to me, because I feel that. I don't need someone to complete me. I complete myself. I don't believe that you need a person to complete you. That's my philosophy." Simpson said of the song, "It's