Subject
Operas
12
Songs (High voice) with piano
7
Songs (High voice) with orchestra
4
Music
3
Songs (Medium voice) with piano
3
Choreographers
2
Instrumental music
2
Outdoor recreation Safety measures
2
Part songs, Italian
2
Popular music
2
Songs (Low voice) with piano
2
Wilderness survival
2
Algebras, Linear
1
Asteroids
1
Astronomy
1
Autism in children
1
Automatic control Polyglot
1
Ballet dancers
1
Book industries and trade Polyglot
1
California
1
Cantatas, Secular
1
Child development
1
Children with autism spectrum disorders Rehabilitation
1
Collisions (Astrophysics)
1
Colors
1
Colors Languages
1
Comets
1
Cosmology
1
Crops Genetic engineering
1
Dance
1
Dancers
1
Documentary photography
1
Doppelgängers
1
Ear Anatomy Models
1
Earth (Planet)
1
English language
1
English literature
1
Europe Languages
1
Eye Anatomy Models
1
Family-owned business enterprises
1
Fathers on television
1
Food Biotechnology
1
Food security
1
Genetically modified foods Economic aspects
1
Genetically modified foods Social aspects
1
Geography Polyglot
1
Glees, catches, rounds, etc
1
Happiness
1
Human-alien encounters
1
Industrial accidents
1
more ...