Read Music

You can read music. You can buy a music book for 5 gp. This functions similarly to a wizards spellbook. You practice a list of bard spells equal to the spells known column in the bard class features. The spells must be of a level for which you have spell slots. You can only cast practiced spells. Casting a spell does not remove it from your list of practiced spells. 

You can change your list of practiced spells when you finish a long rest. Practicing a new list of bard spells requires time spent studying your music book and memorizing the notes and rhythms you must play to cast the spell: at least 5 minutes per spell level for each spell on your list.

You can cast a ritual spell, even if it is not practiced. It must be in your music book.