Final answer:
Jason said Lolly's siren song sounds like 'Oldring's knell' and a clear, high voice in a monotonous singsong.
Step-by-step explanation:
In the given text, Jason compared Lolly's siren song to different sounds. In one instance, he said it sounded like 'Oldring's knell,' which is a sound made by wind blowing a gale in the caves.
This sound is described as being hollow, unearthly, and made up of a thousand piercing cries. In another instance, Jason compared Lolly's siren song to a clear, high voice in a monotonous singsong.
This voice had a deliberate, drawling, aspirated chant, which is known to have a cruel and pitiless effect on listeners.
Hence, Jason said Lolly's siren song sounds like 'Oldring's knell' and a clear, high voice in a monotonous singsong.