solo
Unless it is featured as a solo instrument, none. The sax is primarily a band instrument.
The drumset is mainly an ensemble instrument. It and the bass keep time, though there are exceptions...
both
The saxophone is often a solo instrument. It can be the only horn in small group. In concert bands and jazz big bands there are sections of saxophones. So they play melodies and harmonies in those situations. Saxophones also back up vocalists and other musicians in many groups. With 'horn lines' and things like that.
I would think they are usually group instruments, such as in a jazz band, you would see more than one playing.They can fill either role equally well. You'll find plenty of works for both solo trumpet and trumpet section.
A flute can be played solo or as part of an ensemble. When played solo, the flutist typically performs alone without accompaniment. Solo flute repertoire includes pieces specifically written for the instrument, such as concertos and sonatas, as well as arrangements of music originally composed for other instruments or ensembles. The flute's versatile range and expressive capabilities make it well-suited for solo performance in various musical genres.
The solo instrument is a violin.
Wesley Mcgoogan
An instrument solo in a band is when every one else is quiet but the one instrument that has the solo.
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The tune Greensleeves can be played by a myriad of instruments. It can be played by a group or on a solo instrument. It can even be sung.
A sideman is a professional musician in a group in which he or she is not an official member. A sideman may tour with the group, perform solo acts or play an instrument with the band.