Probably the piano, due to it being much more versatile than a string instrument.
The piano and the violin were the most popular solo instruments used in the concerto of classical period. The violin was one of the most popular for the baroque period, and the increase in popularity of the piano caused that this instrument replaced the former. See http://au.encarta.msn.com/encnet/refpages/RefArticle.aspx?refid=761553032
I think the piano is a popular instrument. But I also think guitars a and drums are too.
Guitar!(:
violin because it describes more pain
Violin + Cello + Piano Violin + Violin + Piano Violin + Viola + Piano
The musical instrument isn't that popular compared to the violin. In most places musicians start of by playing the violin and then learn the viola afterwards. Violas don't often get the tune in orchestral pieces and therefore many people choose the violin over it. However the viola is becoming more popular and composers are starting to use it more often due to its deep, rich tone.
He wrote piano music, solo (with piano accompaniment) pieces for violin and cello. He wrote pieces with orchestral accompaniment for piano, violin, and cello. He wrote chamber music for string quartet and for piano trio (piano, violin and cello). Most of his music is orchestral and operas.
guitar piano saxophone trumpet tuba violin
The piano is more popular, infact the piano is one of the most popular instruments in the world!!
organ, piano, and violin organ piano and violin
It is a Sonata For Violin & Piano.
Mastering the violin is generally considered more challenging than mastering the piano due to the technical demands of the instrument, such as bowing techniques and intonation control.