Communication may also occur via whistles, hums, and screeches. During recording, Waters emphasized his singing with hums and sighs. The hums, whines and purrs of these particular 'mobiles should not be taken lightly. The piano plays a waltz-like triplet figure while the bass hums the melody beneath it. Hums and coos are more reassuring within the group. Safe from the tiger, she hums a lullaby for Tom, and he falls asleep. Pressure is applied to these areas as the patient hums or sustains a vowel. During Hola Mohalla, Anandpur Sahib wears a festive appearance and hums with activities in March. In Gabrielle Roy's "The Tin Flute", published in 1945, the character Emmanuel hums "Amapola". He often hums "My Bonnie Lies Over the Ocean" to himself. It hums, each episode these three (sic) feeling more well-paced than the one before. Homer also hums along to "Summer Samba" at a later segment in the car. The blade hums when danger is near and can cut through anything without resistance. Two hums have been linked to mechanical sources.