"Singin' Billy" was the nickname of shape note composer and publisher William Walker.

Entity and relation annotations:
id: 0
type: entity
value: text: "Singin' Billy"
labels: <Person>
id: 1
type: entity
value: text: William Walker
labels: <Person>
id: 2
type: entity
value: text: shape note composer
labels: <Title>
id: 3
type: entity
value: text: publisher
labels: <Title>
type: relation
to_id: 1
labels: Person:coreference:Person
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type: relation
to_id: 2
labels: Person:holds_title:Title
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type: relation
to_id: 3
labels: Person:holds_title:Title
from_id: 1