For instance, if the person is feeling low and sad, does he/she choose to listen to music or songs whose lyrics reflects the sadness, or similarly when in a happier mood to listen to music that is more upbeat and cheerful?
Yes, music "can be associated with an individual's state of mind or mood in a given point of time". Yes, we can "choose to listen to music or songs whose lyrics reflects the sadness, or similarly when in a happier mood to listen to music that is more upbeat and cheerful". But here I want to make one remark. If you change your phrase "to listen to music" on the other phrase "personally to performance music on the musical instruments" then you can enjoy a million times more. As to me, I play the piano more often Beethoven's Appassionata (Piano sonata No. 23) in the case of bad mood and sadness and Chopin's Polonaise No. 6 in the case of joy and good mood. To my opinion, live performance of music is the best musical teraphy.
Yes and no. If people are feeling sad and want to continue to feel sad, they will often choose music that matches their emotional state. Conversely, if they are sad and want to feel better, they often choose music to elevate their moods. This, however, requires acknowledgement of their mood state and a conscious effort to improve their moods. I don't believe, however, it is able to be generalized for someone with a mental illness (such as depression).
@Muhammed, that sounds appropriate. What we find in music therapy in the US is use the "iso principle" where we introduce music that matches the current mood/affective state and gradually change the music to elevate the mood and reach a target state. This can take some significant training to establish familiarity and comfort in implementing. I use it more often for children in changing their states , where I gradually slow down the tempo to calm them or gradually increase tempo and mode to increase their moods, again as a trained music therapist. Perhaps an idea to consult a local music therapist on implementing this technique.
I think, if the person is feeling sad, he/she choose to listen to music or songs which reflects the sadness, or similar in case of happy mood he/she would prefer happy or cheerful music.
May be the music we would like to listen, generally reflects our own state of mind to enjoy it more. Thus generally people prefer same mood songs to experience the same mood or continue in the same mood more.This is true most of the time but not always as if person wish to change the mood then he/she might would like to listen to different mood songs.