These are metal tubes. 
Tubular bells are metal tubes. 
Tubular bells are musical instruments in the percussion family. 
A player hits the top edges of the tubes. They use a hammer made of plastic or rawhide. Some instruments have a pedal. This pedal helps stop the sound of all the bells at once. You can also use a violin bow on the bottom. This makes a very loud, high sound.
These bells add color to an orchestra or band. They do not always play a melody. Sometimes they have a solo to sound like a church. Giuseppe Verdi used them in his early operas. Many famous composers use them too. Gustav Holst used them in "The Planets." Mike Oldfield used them on his first album.
Tubular bells are special musical instruments in the percussion family. 
Each bell is a metal tube. A musician tunes the bell by changing its length. The standard range for these bells is C4 to F5. Some professional instruments can even reach G5. To make a sound, a player strikes the top edges of the tubes. They use a hammer made of plastic or rawhide. Some instruments have a sustain pedal to stop the sound. You can also use a violin bow on the bottom of the tubes. This creates very loud, high-pitched sounds.
These bells have a long history in classical music. Giuseppe Verdi was the first to use them in an orchestra. He used them in his operas like Rigoletto in 1851. He also used them in Il trovatore in 1853. Finally, he used them in Un ballo in maschera in 1859. Since then, many famous composers have used their sound. They wanted to bring the feeling of bells into their music. 
Many great works of music feature these chimes. Pyotr Ilyich Tchaikovsky used them in the 1812 Overture in 1880. Gustav Mahler used them in Symphony No. 2 in 1895. Giacomo Puccini used them in Tosca in 1900. Gustav Holst used them in The Planets between 1914 and 1916. Even more recently, Arvo Pärt used them in Cantus in Memoriam Benjamin Britten in 1977. There are many different pieces that use this unique sound.
You might hear these bells in other places too. Mike Oldfield used them on his first album called Tubular Bells. This was a famous album from 1973. He found a set of bells at The Manor Studio in Oxfordshire, England. He found them after John Cale had used them there. These bells are also used in longcase clocks. They are louder than gongs or regular chime-rods. This helps people hear the time more easily.
Tubular bells, which are often called chimes, are percussion instruments.
Each individual bell is a metal tube. The pitch of each bell is determined by its length. To tune the instrument, a maker alters the length of these tubes. The standard musical range for these bells is C4 to F5. However, some professional instruments are larger and reach G5. 
There are different versions of these instruments used in various settings. Large tubular bells are the standard for orchestral performances. In recording studios, musicians often use studio chimes instead. Studio chimes look very similar to standard tubular bells. However, each bell in a studio set has a smaller diameter. This makes them less expensive than full-sized orchestral sets. 
The physics of the sound is quite fascinating. The tubes produce a purer tone than solid cylindrical chimes. For example, a mark tree uses different types of chimes. In tubular bells, specific mathematical ratios determine the strike tone. Modes 4, 5, and 6 have frequencies in ratios of 92:112:132 or 81:121:169. These ratios are very close to 2:3:4. Because they are so close, the human ear hears them as nearly harmonic. This helps the listener establish a virtual pitch. The perceived strike pitch is actually an octave below the fourth mode.
Tubular bells have a rich history in classical music. Giuseppe Verdi was the first to use them in an orchestral setting. He featured them in his operas during the mid-1800s. He used them in Rigoletto in 1851. He also included them in Il trovatore in 1853. Finally, he used them in Un ballo in maschera in 1859.
Many notable musical works feature these bells. Pyotr Ilyich Tchaikovsky used them in the 1812 Overture in 1880. Gustav Mahler used them in his Symphony No. 2 in 1895. Giacomo Puccini used them in Tosca in 1900. Gustav Holst included them in The Planets between 1914 and 1916. In more recent history, Arvo Pärt used them in 1977.
Beyond the orchestra, tubular bells appear in popular culture and daily life. Multi-instrumentalist Mike Oldfield used them on his 1973 album, Tubular Bells. He discovered a set of bells at The Manor Studio in Oxfordshire, England. These bells had been used by the musician John Cale.
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