What are the differences between a marimba, xylophone, and glockenspiel in terms of their construction, sound characteristics, and playing techniques?

The marimba, xylophone, and glockenspiel are all percussion instruments, but they differ in construction, sound, and playing techniques. The marimba is larger with wooden bars and resonators, producing a warm and mellow sound. The xylophone has smaller wooden bars and a brighter, more percussive sound. The glockenspiel has metal bars and a high, bell-like sound. Playing techniques vary, with the marimba using mallets for a wide range of dynamics, the xylophone requiring precise striking for clarity, and the glockenspiel using a light touch for a shimmering sound.