Abstract : The first part of my thesis is the description of an algebraic model for synchronized time series. It's an extension of the classic relational model, to which we add a new type: the time series type. The relational algebra is enhanced with three new operators dedicated to time series. Those operators enable us to retrieve all usual operations on time series. A user query language is provided, as well as several examples, most of which are chosen in the symbolic score management domain. The second part is the description of an index structure allowing to conduct several types of queries on symbolic scores (exact, transposed, with or without rythm and approximate). This index relies strongly on the notion of algebraic signature. In the last part, I describe a platform dedicated to symbolic music scores management, which is an application of the two previous parts.