Possible Clues:

• Solemn notes for an extremely unbusy time
• Music for funeral processions
• Funeral pace by army escort
• A go-slow for the late month
• When time is so slow, the month is not more, it seems
• Played of late, even when there's no life in the month
• Funereal music played in late spring
• Of late this may be played when the month is no more
• Music from Handel in a dull period just before spring?
• Not a lively month, of late