Abstract: A recommendation item determination system is configured to: compute an emotion index of a user based on a voice signal acquired from a conversation between the user and a conversational partner of the user, compute a personality element index based on a speech text generated by voice recognition on the voice signal of the user; generate a first personality model of the user based on the emotional index and the personality element index, compute, respectively for a plurality of personality types, personality type similarities each of which is a similarity between the first personality model of the user and the first personality model of the personality type; generate a second personality model of the user based on the plurality of personality type similarities; extract one or more items from a group of items represented by the second personality model; and determine a recommendation item based on the extracted one or more items.

Abstract: A stringed musical instrument includes: a body; a neck extending from the body in one direction, a string being tensioned at the neck and including a first end portion to be held by the body and a second end portion to the held by the neck; and a rod provided in the neck and extending in a neck extending direction. The neck includes: a first neck portion to be held by the body; and a second neck portion provided on an opposite side of the first neck portion from the body in the neck extending direction. The second neck portion holds the second end portion of the string and is attachable to and detachable from the first neck portion. Each of the first neck portion, the second neck portion, and the body is formed with an insertion hole in which the rod is insertable in the neck extending direction.