App for iPhone that use Spotify API

We want an app for iPhone that use Spotyfy API and store the BPM (beat per minute) the different songs have in a playlist. It must be able to select playlist. The information must be stored in a database. After the database has collected the BPM for every track, we want to be able to start music within a range of BPM. For example, start playing music with a BPM between 110 and 128. We do not know what information we can retrieve or if this is even possible, and we do not know how to find the BPM for every track. When you give us an offer on this project, please explain what you can develop. This is the first part of this app. If we find a way to work together, we will continue to work with you and continue to develop this app. ## Deliverables N/A