A portable speaker for a music play such as an iPod® player. The housing of the speaker is shaped and sized as a cup and can be placed inside a commonly seen cup holder, such as a cup holder in a car or other vehicles, a baby stroller, a foldable camping chair, etc. The speaker housing has a slot for receiving a music player, as well as electrical connectors for electrically connecting to the audio output of the music player. The sound producing devices are disposed within the speaker housing and face upwards and/or downwards.