We don't have synonyms for aftertimes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are oftentimes, aftertime and afterlives.
(n) :
(music) The process in which a harmony singer or background singer repeats a line or a series of words in a song separately after the lead singer rather than singing it in unison with the lead singer; prominent in country music and Southern gospel.
(n) :
(music) The process in which a harmony singer or background singer repeats a line or a series of words in a song separately after the lead singer rather than singing it in unison with the lead singer; prominent in country music and Southern gospel.